GearToyGear is a crazy fast paced tunnel shooter that is like playing elite while on drugs. Fly down the tunnel avoiding bullets and destroying objects, as fast as you can, and if you want to go faster there is a button for that too!
You can download it for xbox and windows here: http://www.asahi-net.or.jp/~cs8k-cyu/xna/gtg/index.html
GearToyGear is made by ABA Games, you can see the rest of their collection on their site here:
And yes, its all pretty trippy!