Torus Trooper

http://www.asahi-net.or.jp/~cs8k-cyu/windows/tt_e.html

This high speed tube type game reminds me of Tunnels an old 1991 game i used to play on my PC. Its also got a flavor of Tempest to it as well. It is free and has some good beats to it while you are playing. Pretty addictive, but not alot to it, so you play for a while and its just the same thing over and over without the levels getting to different. No time trials etc.

Check it out. :o)