First off, if you haven't got Retro/Grade yet and you have a PS3, go get it. Right now. It's on sale for $3.49 ($2.44 if you have Plus) until PSN updates. Seriously, go. That's sub-coffee cheap.
Okay, for those of you who want to play 24 Caret's unique backwards-shmup music game on a different platform, the developer has announced plans to bring it to Steam for PC on March 20. This version is more versatile, supporting Xbox 360, PS3, and Wii guitar controllers!
Retro/Grade is a videogame developed by 24 Caret Games. The game is about ace pilot, Rick Rocket, who must repeat his last space battle in reverse in order to protect the space time continuum.[3] The game play is rhythm-based and timed to original music by Skyler McGlothlin. In January 2009, it was nominated for two Independent Games Festival awards: Excellence in Audio and Excellence in Design.