Recently, meaning the day I made this thread, I downloaded and played the game Audiosurf. I have to say, even if it was only the demo, the game turned out to be much better than I expected. The track moves the beat of the music, and it has interesting shapes and colors. It has dynamic speeds, with twists and turns. And best of all it's to your music! You can even play the orange box music, which is some pretty darn good stuff. The game actually ended p being challenging (for me), much more so than I expected. I would rate this game very highly and recommend it to others.