I had a review for this before. But that was when it was in early access.
Now this is a review for the game now it has been released.
You should be buying this already. Hell, you should have already bought it.
Here's the deal. Do you like tower defence? Do you like roguelikes? Do you like dungeon crawling strategy type games? If the answer to all three is yes, then I can imagine your trepidation at hearing that this game combines all three, as I was nervous too. I mean there IS such a thing as too much of a good thing, and too many cooks spoil the broth, and sometimes many great things added together do not make an awesome thing...
But in this case you can lay your fears to rest. Dungeon of the Endless is an incredible game, so much fun, brutally difficult and very rewarding. It requires quick thinking, strategic planning, and a buttload of blind stupid balls-to-the-walls courage at times.
The BAD parts of this game is that the view is very zoomed in, and there are only two states to the view. Zoomed right the hell in, or zoomed right the hell out so it looks like a map screen. This DOES make things slightly awkward, especially if you have split your party to explore a particularly large dungeon, or if an attack comes from various areas of the map.
Secondly it's unforgivingly hard, even on "Too Easy" mode. The game lies. Too Easy is still brutally hard. You will lose party members. You will get two floors with a new team member unscathed, only to have them die suddenly and unexpectedly during the rush to get the crystal to the next floor before you can unlock him or her fully.
Thirdly the pixelly graphics may not appeal to some. To me, personally, they are amazing, I love them. They've got a lot of charm, BUT I recognise that it isn't always everyone's thing. It CAN also make combat extremely confusing. Granted you don't have to directly target any enemies, but it's still difficult to watch lots of things at once.
Finally the control system takes a little getting used to. It's simple enough to navitage everything via right clicks and left clicks and such but getting used to the UI and how it does equipping and everything is .... well it feels slightly counter-intuitive. An ability to click-drag items about would have been nice for example, and a quicker way to open/close inventory/stat panels too...
Now for the good stuff:
Music? Really nice. Not too epic, sadly, but not annoying at all, or obnoxiously loud and grating, nor does it overwhelm you. The devs know when to use what music and it's very apparent that in that aspect their sound design is definately on the ball.
Gameplay mechanics? rock solid. Resource management and building, turret defence/augmentation placement, power management and placement, the Risk/reward nature of opening just one door or many doors for the added XP/loot multiplier at the risk of being overrun by swarms of enemies, the various different types of enemies and their priority targets, the sheer volume of characters and skills and strengths... The pure joy of opening a door and finding a merchant or item box and being able to equip something awesome is amazing. Finding cool little things like Steles or Research Artefacts is also great fun.
Also this game has an amazing, rather dark sense of humour. Characters make quips as they traverse between levels and as they open certain doors, they talk to each other, they crack jokes... The item/skill/module descriptions as well are ALWAYS worth reading too for a good chuckle.
As for a game that's come through Early Access? Incredible results. It's come out so polished and refined, and so full of meat and bones that it's become an even greater game for all the feedback the fans gave it. This is well worth your money and absolutely a lot of fun.
Just be sure to prepare yourself for inevitable demise.