Audiosurf Insanity!
This game is a perfect combination of music and Video Games, it's customizable features and multiple characters with different outstanding traits. Have a favorite song? Favorite artist? Play it to Audiosurf! The ships will have as much fun as you will! The best part is the difficulty levels, you can go from casual up to the ultimate challenge that is Pro difficulty on Ironmode, one hit on Ironmode, and you lose the song. I've played so many hours of this it isn't even funny.