Arena 3000 was written while I was nursing a broken leg and wasn't able to go into my day job at Introversion. It's a simple shooter based on the robotron school of run and shoot. Use WSAD to move (or the cursor keys) and left mouse button to shoot in the direction of the mouse cursor. Try to get 1 shot per kill in order to get a 100% accuracy rating on a level. the higher your rating the more points you get. You can spend points in the store to upgrade your ship. To enter the store wait for the 'prepare for level' screen between levels and press 'S'.
The game also represents my first attempt at using Flash CS4 and it's new textured triangle routines so it should make use of your accelerated graphics card. All code, art and audio are by me.
Good luck - and like I say, this was written while nursing a broken leg and not able to continue working on Darwinia+