To me, it's hard to make a 2D Cartoony style like this entertaining, and honestly I laughed a lot as I discovered the cows along the seasons, the aliens' animations, and of course, Barney ! This toilets cabin makes him so alive, and yet we never see the guy ! Now, imagine that all the 'towers' you put in the fields are alive too... Man, this ambiance is soooo fun ! It's actually a part of the machine, but it's also its eyes. It's a vent, but it's also its mouth. Just love the design of these characters/machines ! Mobs have suits, costumes, cohesive animations, and their abilities are related to their appearance. You could guess what it can or cannot do by just looking at them. It's very pleasant and made me feel like I was watching a good old cartoon from Tex Avery/Hanna Barbera. So alive !
Then came the game... I really don't like Tower Defense game type. BPE is the first one I DO want to complete ! God, I felt entertained all time long ! The first levels were clearly designed as tutorials. That's why all the people who got used to play TDs may be bored, but I think their experience will allow them to complete these levels very fast, to finally get to...
... THE ZAPPER !
Here is how you can turn a simple TD into a frenetic game experience : developpers managed to give you this intense feeling of being overwhelmed, without simply adding mobs, and mobs, and a new wave of mobs... The ZAPPER ! They also played on mobs' resistance, and finally managed to balance mobs' speed, defense, zapper's power, machines' utility and player's actions so that you have a lot of things to setup, manage and use... but in a very effective way ! Everything is damn simple to understand and use, and provides a lot of fun ! Don't... forget... to use... the ZAPPER ! It's your best ally all game long !
And finally, a new dimension came to my attention: mobs' transformations ! You think you killed it, it turns into something else ! Hard Rockers turn into "Berserk Hard Rockers", Zombies turn into graves, where new smaller zombies emerge, ... but I won't spoil everything ^_^ I found these game mechanics very inventive !
A lot of TDs should take example on this game. It's simple, yet effective and terribly addictive, fun and easy to play, and includes a very well balanced challenge.
I should have given feedback on the 'charismatic' fields, or on the growing number of aliens' spawn points as you progress in the game, or maybe on the evolutive environment (mushrooms and their spores, ice forming on your machines during winter and the zapper's utility at this moment of the game,...), and maybe I should have told you about the bosses, the drill, the gears or the cow bell... but I really have nothing to say about it, because everything was part of the fun, and very well thought !
Play this game, it really worths its price !