BlazeKick: Crypt of the NecroDancer is the game I never knew I wanted until I heard about it, and I'm so glad it's turned out as well as it has. Beautifully mixed gameplay, wonderful music, and non-too-distracting graphics make this game almost perfect. The difficulty curve is a bit steep and it almost depends too much on luck in the later levels, and the graphics could be touched up just a pixel more of detail, but past that, this is a wonderful game.
Crypt of the NecroDancer is the game I can't shut up about and can't stop playing. Buy this game.