Unique and vastly underrated indie XBLIG game, Sequence, has hit the e-shelves on Steam. You can pick up this Iridium Studios gem for 10% off at $4.49, or $4.99 normally which is a total steal.
Sequence is by far my favorite indie game of the year. Imagine DDR but with a delightful RPG twist -- you defeat enemies by casting spells set to some pretty awesome beats by Ronald Jenkees and Michael Wade Hamilton. Enemies produce certain drops based on rarity which can be combined to make new spells, items, and even a hidden level. It's all topped with complete voice acting and over 10 hours of gameplay -- although if you're a completionist freak like me, it could be many more.
So if you have an urge to satisfy your inner rhythm/RPG nerd, I'd highly recommend picking this one up!