Award-winning rhythm-based roguelike Crypt of the NecroDancer has just launched on PC, Mac and Linux via Steam Early Access, where it's going for £10.99 / $14.99.
The delightfully titled game tasks players with dungeon crawling through a proceedurally-generated environment where they can only exert actions in response to the beat. As such, it's turn-based, but your turns last less than a second. Think Beat Sneak Bandit if it were a roguelike rather than a stealthy puzzler.
Developer Brace Yourself Games' peculiar genre mashup can be played with conventional controls, like a gamepad or mouse & keyboard combination, but its grid-based movement system is designed to work with a USB dance pad ala DDR. It even has a co-op mode if you wish to play it by dancing with a friend.
Another cool feature in NecroDancer is that it lets you upload your own MP3s to dungeon crawl to. Though the default music is by Super Meat Boy composer Danny Baranowsky, so there's no shame in sticking with that.
Crypt of the NecroDancer was an Independent Games Festival 2014 finalist in both best design and best audio. It even snagged an honourable mention for the Seumas McNally Grand Prize.