Amplitude Studios are having one hell of a year. Not only is its strategy title Endless Legend one of the year's biggest surprises, one of its other games is also going to quietly sneak onto some people's GOTY lists as well.
That game is Dungeon of the Endless. It's a... weird game, one that mixes rogue-like dungeon exploration, RPGs and tower defence and somehow gets it all to work.
You play a team of space-farers who crash on an alien planet, and have to escort a crystal through a huge dungeon and get it to the surface. That dungeon is randomly generated, though, and to get through safely you'll need the help of automated guns (and other helpful gadgets). Only the number of rooms in the dungeon you can use them in are capped, and it's kinda turn-based in that you can only advance your research/experience every time you open a new door in the dungeon and...
It's a lot to get your head around -- the game's tutorial even ends with a shrug that you're going to die a lot -- but once it starts making sense, this is a game quite unlike anything you've ever played. Confident in what it's messing with, assured that it's going to work, brutal in the way it just doesn't give a hit how you feel because it's going to kill you at a moment's notice.
It also has some great pixel art. You should check it out.