I wasn’t able to get the game below 1.7k, and that was using the png-compression trick ;)
The game was coded in half an afternoon and is thus rather lame - just try to survive and kill as many enemies as possible.
Use [WSAD] to move and point the mouse to aim, ever so often your weapon will get a power-up, enabling you to kill
The game clearly is inspired by Geometry Wars, try it!
Also: Please don’t look an the source - it’s horrible.