Sorry for the "Necro" bump, lol, but this just came out on Steam yesterday for $15. Worth every penny, too! It's technically an "Early Access" title, but it is already a quite complete game, just missing the fourth and last area and some unlockable characters, I think.
But fans of rhythm games and roguelikes will find this is a great mix of the two genres. And if you are into BOTH types of games, like I am, this is your dream game!