So after seeing the review on Kotaku I bought Symphony, a vertical shooter with the same music gimmick like Audiosurf and Beat Hazard, off of Steam. It's pretty fun, the goal is to defeat the cyber "Demons" that are trying to steal the "soul of your music". You can unlock and upgrade new weapons and items for your ship by selecting different songs. Once you unlock a specific item with a song you cannot unlock a different one, which prevents you from farming one track over and over again.
The game starts on Pianissimo (Very Easy) by default, and slowly teaches you about the various features. Since I remembered I have FRAPS I recorded this video of a standard level. The second video includes a randomized Boss fight.
Symphony - Steam store link
Edited, Aug 11th 2012 8:57am by Shaowstrike