Crypt Of The Necrodancer
This is one of the most unique and satisfying downloads in recent memory. Rhythm chess + action RPG + a killer soundtrack.
Danny Baranowsky is known for a lot of great contemporary game OSTs, such as Super Meat Boy, The Binding of Isaac, and Desktop Dungeons.
Not only is this an action-packed, beat-centric dungeon crawler with a 2-player mode, you can even swap out the music using your own mp3s on the steam version. And I've seen it played on DDR mats as well. No matter what platform / interface you have just play this already.
