Planck is an upcoming music-based experiment which looks to play out in a similar fashion to Audiosurf, but with different core elements. Enemies litter your path, and destroying enough of them unlocks a new instrument for the current song.

The game doesn't use your own music - rather, it pieces together a specifically-created soundtrack in a Auditorium-esque manner. You can also jump between sections of the track to mix different sounds and change the music how you see fit.

Looks mighty interesting. No release date or platform set as of yet.