Zeno Clash, a First Person Brawler, using the Source engine.
A game with very nice visuals. It’s hard to describe it, because it’s so original in art, story and even gameplay. Well, at least I can’t find references :P. You play as Ghat, one of Father-Mother’s children, who kills him-her, and then runs away. Along the way you get to have fist fights with all sort of weird characters, some of which are your brothers and sisters (see, it’s not sexist — you get to punch ladies).
I really enjoyed the visuals. Very beautiful, and more importantly, fascinating.