I've got to admit, my initial reaction to the above trailer was that the graphics could do with a bit more work. Then it really gets going, and my interest status changed to 'piqued'.

Substream is 'a music-synaesthesia 3D shooter', according to developer Ben Bradley. These are fancy words which basically mean that the graphics and the enemies move in time with the music - and it's shaping up to be something rather special. The floor bends and dances with the music, rainbows play notes like a piano, waves crash to the beat... and then it all gets very weird, with freaky crane-like arms and huge pillars in the sand. Psychedelic, maaaan!

As far as I'm aware, you won't be able to put your own music into the game - rather, each level will feature set music. Which is probably a good thing, given how poor the 'play your own music' style games have been of late. The game is planned for a 2011 release on PC, and you can check out more details over on the official site.