Nominated for Excellence in Audio at this year's IGF awards, Retro/Grade is a rhythm-based shmup with a twist - the entire game is played in reverse.

Players must listen to the music tracks, set themselves up in the appropriate spots and fire in time with the beat so that each of the lasers which their ship fired comes back into their cannons. It's also essential not to touch any of the enemies bullets as this would create a paradox.

Crazy stuff, which definitely has potential to be something great. Let's hope 24 Caret Games pull it off. If you can't wait to see what the final version plays like, there's a demo version of an early build for the PC for download here.