Defend Your Life! Is tower defense set in human body where players are fighting against villain hordes of viruses and bacteria. Levels and units correspond to reality of human anatomy.
User reviews:
Very Positive (431 reviews) - 85% of the 431 user reviews for this game are positive.
Release Date: Apr 10, 2015

Sign in to add this item to your wishlist, follow it, or mark it as not interested

Buy Defend Your Life

SPECIAL PROMOTION! Offer ends October 31


About This Game

Defend Your Life! Is tower defense set in human body where players are fighting against villain hordes of viruses and bacteria. Levels and units correspond to reality of human anatomy.

Show your tactical and strategy thinking in epic battlefields situated in appendix, pancreas, heart, brain and many others vital organs. Customize build order of towers and use wisely upgrades and mighty spells. Use electric shock, bombard the enemies or support your towers by adrenalin injection. Summon mighty Golem and stop enemies like Flu, Cold, kidney stones or cancer. Everything in outstanding graphics.

Key Features:

  • Enjoy 17 epic battles in real human organs with interactive
  • Fight against 20+ different enemies based on
  • 2 monumental boss fights where you will face the Stonekid and Cancer
  • Command Platelet soldiers and support them in fights
  • Hero Room with specialists ready to fight under your command
  • Build and upgrade 3 attacking towers with rich tech tree and don´t forget to support them with tower increasing range, attack rate or damage
  • Use and upgrade in-game bonuses with strong effect during fight – explosive bombs, electric shocks or adrenaline increasing attack rate of your towers
  • Enjoy the game on easy mode or accept the challenges of medium or hard difficulties
  • Read the in-game encyclopedia in order to take advantage of the knowledge about enemies and buildings
  • Use headphones for engaging audio experience included original music and sound design.
  • Enjoy the awesome hand painted levels and catchy cartoon animations
  • Addictive gameplay that will hook you in the human body for hours and hours!

Contact & Support

For all news, strategy guide or full wiki of Defend Your Life! visit

If you would like to learn more about our studio Follow us @AldaGames, like on Facebook or visit our website at:

System Requirements

    • OS: Windows XP Service Pack 3
    • Processor: Dual Core CPU
    • Memory: 1 GB RAM
    • Graphics: OpenGL 3.0 compliant with 512MB of video RAM.
    • Storage: 400 MB available space
    • OS: Windows XP Service Pack 3
    • Processor: Dual Core CPU
    • Memory: 2 GB RAM
    • Graphics: OpenGL 3.0 compliant with 1.0GB of video RAM.
    • Storage: 400 MB available space
Customer reviews
Customer Review system updated Sept. 2016! Learn more
Very Positive (431 reviews)
Review Type

Purchase Type


Display As:

(what is this?)
183 reviews match the filters above ( Very Positive)
Most Helpful Reviews  In the past 30 days
2 of 2 people (100%) found this review helpful
Not Recommended
5.5 hrs on record
Posted: October 2
This game is way too unbalanced. Starts off ok, but after you've invested a lot of time into it, the game becomes unreasonably difficult. Expect to be constantly redoing missons. Also there's hardly any variety in the towers. Kinda boring. I quit halfway through the campaign. There are much better games out there.
Was this review helpful? Yes No Funny
3 of 4 people (75%) found this review helpful
3.8 hrs on record
Posted: October 23
This is an interesting game from a certain point of view. I enjoyed playing it, does have a special graphic and great game mechanics, the overall sound is good. Keeps you entertained and satisfied.
Was this review helpful? Yes No Funny
2 of 3 people (67%) found this review helpful
19.9 hrs on record
Posted: September 29
Don't expect a perfect game.
But it is a cool tower defense game.
Was this review helpful? Yes No Funny
Most Helpful Reviews  Overall
77 of 93 people (83%) found this review helpful
1 person found this review funny
12.5 hrs on record
Posted: April 10, 2015
For such a cheap price at release i.e. 80% off the usual £3.99, I had more fun playing this Tower Defense (TD) game than I've had playing a lot of games I've paid 20 times as much for. Defend Your Life is a typical TD game with the usual tower purchases, for example upgradeable cannons and tesla towers, as well as other towers that slow units down or toss grenades, plus there are special towers such as those that give you extra oxygen. Oxygen is the currency in game which allows you to purchase more towers and upgrades, plus at the end of each level you are awarded tablets and diamonds, both of which can be spent either on upgrading your tower defenses or on special upgrades that can only be used once to top up other defenses that usually take time to recover such as the electric shock , bomb or adrenaline.

The theme of this TD game is biological, with a human body being attacked by viruses. Each level gradually takes you further into the body. You can set the speed up to four times the normal speed and/or select from three different difficulties. Even at full price I think Defend Your Life is a bargain. I reckon most TD fans will enjoy this game and it's also an excellent introduction for those new to the genre. The easy mode is relatively easy to beat. I played through several levels with no losses. The harder levels give less currency to buy the various upgrades and the speed of the viruses are increased, plus you get less oxygen currency to start with.

With 22 different enenies, all with different strengths and weaknesses, for example the flu virus divides into two weaker flu viruses when it is killed and the Nicotinic unit disappears when first hit and is immune from attack while invisible, at least from the tower defenses. You can still damage these with bombs and electric shocks.

There's a tips and tricks section as well as an encyclopedia that gives you information about each building, for example the Tesla tower does more damage for each shot than any other tower, but takes a longer time to recharge. There are some nice little touches like the defensive towers that when activated create little beings that don't do actual damage, but block the path of incoming viruses. When damaged they recover fairly quickly. If destroyed new ones will replace them before the next wave. You can start the next wave early by clicking on the warning symbol that pops up near the place where the viruses first appear. The quicker you do this, the more oxygen is added to your total, giving you more currency to buy or upgrade towers.

The 20 achievements for this game are relatively easy to attain, so long as you can survive the waves of viruses. You can see a video of game play HERE. I highly recommend this game
Was this review helpful? Yes No Funny
33 of 40 people (83%) found this review helpful
2 people found this review funny
3.1 hrs on record
Posted: April 12, 2015
I like this game quite a bit. Yeah its a generic tower defense game but its done very well. The economy and upgrade functions are solid and all the towers are solid with the level design functional. Also the theme is under explored. The graphics are charming and well done.
Was this review helpful? Yes No Funny
20 of 20 people (100%) found this review helpful
1 person found this review funny
57.7 hrs on record
Posted: January 9
Defend your life - Your everyday tower defense game.

First of all, I would like to say that I am recommending this game mostly for the casual gamers or for younger players. If you are a gamer that only goes for AAA games, this is not for you (though I guess that goes without saying).

So, in general, here are the pro's:
+ quick / easy / fun to play (mildly adictive)
+ nice gradual difficulty progression
+ very fluid
+ excelent for a first tower defense or for younger audiances
+ you can beat the hell out of Cancer
+ Easy to get the full set of achievements
+ Good value for money.

The cons:
- Doesnt seem to fit the screen. I keep on getting the impression that I dont see what is going on the edges of the map
- Game tends to become very slow during the final waves of the last level.
- While playin in window mode, you will have to minimize windows bar
- Sometimes the UI blocks you from seeing enemies or selecting them
- ...cant recall of anything else that could be bad about it.

I started playing Defend your life while I was spending Christmas holidays with the family, as a gap filler in the slower hours, and I couldnt be more pleased.

It is a very simple and very basic tower defense game, based on defending your body against all sorts of virus and problems - which will be your enemies.

In the begining, the game seems to have a childish look to it, and more adult people will probably relate it to the 80's cartoons "Once upon a time... life". The first couple of levels seem to be extremely easy and you feel that the game will get boring very soon. However, the difficulty level escalates in an interesting progression, and most levels seem to introduce something new. It gives you some time to learn in depth about all the enemies and defenses that you have available without "setting out the wolves" on you from a moment to another.

Also, you cannot just jump to the hardest difficulties, as you will have to play "easy" to unblock "medium" and them "medium" to unblock "hard". This has some sense to it, has you will need to get money to evolve your bodies defenses, in order to make it into the harder difficulties. Otherwise, it would just be impossible.

You will also have the opportunity to play with heros that will help you defend your body. These characters are upgradable in power, speed and health, and they will be fundamental for you to beat the game in the later stages.

For the achievement hunters, it is also a great game to have. You can actually tick most of the achievements on your regular game play. No need to go into laborious tasks that in the end are boring and sound like a lot of work.

All in all, it is a quick / easy to play game, that brings you a great value for money. I would recommend it!!!

(Another negative - in window mode, it is so easy to forget to close the game and leave the room. I think I got 52h of gameplay in a week and that got me into trouble with my partner, has she thought that I spent the whole week playing games!!!)
Was this review helpful? Yes No Funny
23 of 31 people (74%) found this review helpful
21.6 hrs on record
Posted: April 13, 2015
What a bargin! I got this game for 1 EUR and it is a really nice TD.
I'm not crazy with the health concept that provides the 'story' for this game, but from a gameplay perspective it is really good. There is nothing new, but it is solid TD with loads of towers, many different type enemies, and a nice set of levels. You replay each level for new challenges - don't let the titles Easy, Middle, Hard fool you - each is a new 'campaign'. You have a hero, and can buy different types. Their skill increases as you play.
In general, this game is a casual Kingdom Rush lite.

It has really good tutorials and there are videos for each level if you fail, which makes this game an execellent 'TD starter' casual game for people who wants to try TD.
And it is a casual TD - there are no advanced concepts, developments, or a multitude of levels - but it is casual fun and incredible good value for the money.
Was this review helpful? Yes No Funny
20 of 27 people (74%) found this review helpful
1 person found this review funny
1.9 hrs on record
Posted: April 11, 2015
===// TL;DR Version //===

A decent but rather generic TD on the cheap.

===// Thorough Version //===

It's a recommended buy only if you're looking for a TD fix at a cheap price.
At the moment, when I write this review, it's 80% off.
Otherwise, there's nothing new compared to others in the swathe of TD games on Steam.

If you're looking for something new in terms of mechanics, look elsewhere.

The graphics isn't something to write home about; obvious mobile port is obvious.
The assets are well-drawn, detracting this game from the rest of the run-of-the-mill TD games.
Kinda reminds me of Worms.

It's based on Unity, with the usual Unity launcher and a maximum resolution of...1024x768?
I'm guessing the supported resolutions depend on the max vertical resolution of your display/monitor, which mine is 1366x768 since I'm on a laptop.
It does, however, seem to support multi-display, as in you can decide on which monitor you'd want this game to be displayed in via the Unity launcher.

There are (limited) global upgrades that affects towers' attack & range, tower sell value, specials' effectiveness, and in-level currency-related like how many starting oxygen per level or how much you get per mob kill.
These upgrades are bought using 'tablets', which you can get from finishing a level.
Each level holds a maximum of 7 tablets, which is divided to 3 at Easy, 2 at Medium, and 2 at Hard.
The tablets are finite, but you can easily 'sell' upgrades if you want to put the tablets into other upgrades that you want more.

The specials?
It basically breaks down to the basic three.
A bomb (AoE nuke), electric shock (global nuke), and adrenaline (AoE tower buff).
Yes, that's it.
Specials have infinite usage, only by their cooldowns.

The in-level currency is oxygen, and the in-game one is crystal.
Oxygen is what you use in a level to build towers.
Crystal is, I'm just guessing here, effectively what you'd buy with real money in the mobile version.
Crystals are used to buy boosters, which either adds oxygen, adds life, adds an extra of your strongest unit, resets all specials' cooldown, and global adrenaline.

Yep, typical freemium boosters.

The Encyclopedia is probably the most dodgy part of the game.
The Enemy details is in-game, but when you click for Tower details, the game opens up your browser to load the related webpage on the game's website.
Tips & Tricks is no different from Tower details.
Others is basically other games made by the game studio, and yes, acts the same way as Tower details.

Keep in mind that this game is a 430-ish MB download and 660-ish MB installed, so I don't really get the technical reason as for why they couldn't just cram everything locally in the Encyclopedia.

My conclusion?
Please refer to the TL;DR section at the top of this review. ;)
Was this review helpful? Yes No Funny
27 of 44 people (61%) found this review helpful
2 people found this review funny
3.5 hrs on record
Posted: April 19, 2015
This game was reviewed using a code sent by the developer.

Defend Your Life is a cute little Tower Defence game with an interesting take on things. The whole game takes place in the human body, as you work your way around the body, you encounter plenty of different enemies with some really interesting abilities.

One of the major issues I found here is there is certainly some technical issues still going on, load times are pretty bad, even when the game is installed on an SSD, I was often at a load screen for 15 seconds or so. Another issue I encountered was in the later games when your screen is full of defence towers, was the horrendously bad fps drops, they were so bad at times, that it caused me to lose the level. I would also of liked to have seen an options menu included to be able to change a couple of options such as windows mode, resolution etc. without having to exit the game altogether.

I did like how the game sort of prompts you to go back and get replay previous missions for extra points (tablets in this game), as it is pretty much impossible to progress at some points without going back to farm extra tablets to upgrade your abilities and towers.

Hopefully the technical issues can be ironed out, and if they can, then Defend Your Life is an excellent tower defence title, I will still recommend it now, because after all, I played it for almost four hours and still had a really good experience.
Was this review helpful? Yes No Funny
7 of 7 people (100%) found this review helpful
1 person found this review funny
3.9 hrs on record
Posted: April 24
Defend Your Life is surely fun to play, but it is hard to recommend it highly over the superior games like Plants vs Zombies or Kingdom Rush that are available on the steam market. Anyway players looking for a challenge will definitely be satisfied due to the extra difficulty settings which effectively triple the number of stages to play through.
Was this review helpful? Yes No Funny
Recently Posted
FD God
5.1 hrs
Posted: October 23
timepass game
Helpful? Yes No Funny
0.7 hrs
Posted: October 22
Good Towe Defense game!
Helpful? Yes No Funny
Plague Doctor
15.2 hrs
Posted: October 1
Product received for free
I didn't play a lot of tower defensive games, but this is really good one. You can teach some new things about human body and other interesting stuff, only thing i don't like is the menu. I just think it's not done properly.
Helpful? Yes No Funny
0.5 hrs
Posted: September 24
Generic TD game with no interresting gimick. So generic it's boring.
Helpful? Yes No Funny
0.8 hrs
Posted: September 17
Quite an enjoyable Tower Defense game, so far...
Helpful? Yes No Funny
6.9 hrs
Posted: August 21
waiting for a fix so i don't randomly sell my towers by left clicking on them
Helpful? Yes No Funny
30.0 hrs
Posted: August 11
Reminds me of the game Kingdom Rush...which is a good thing. Solid tower defense. Achievements are fair and you don't have to play each level perfectly to get them.

Rating 8 / 10
Achievements- Very fair
Helpful? Yes No Funny