I was surprised no one has made a thread about this before. For me, Audiosurf is my casual "get away from it all" game. When I am frustrated with another game, just need to relax and listen to some music or just when I feel like, I keep coming back to Audiosurf.
By casual, I mean I play Mono Pro with an Xbox 360 controller. It's just nice to sit back and ride your music :P. Anyone else a fan? What kind of music do you end up playing? Right now I am a fan playing Rammstein in-game.
I got it when it first came out and it's definitely one of those between-game games for me too. Usually if I have a song stuck in my head that I just HAVE to listen to I'll play it on Audiosurf. Definitely worth the $10