You're a little man that shoots everything. Going to the next level involes finding the exit (enemies will go towards the exit if it's closer to them than you are) and that's about it. I originally just made this is as sort of a stupid reason to have lots of bloody particle systems, but for some incredibly stupid reason I deleted all the bloody particle systems and I'm too lazy to put them back in. I will someday though, because the bloody particle systems rock :D
Only tested on a Windows 2000 machine with an Athlon 2000 and Geforce 4 TI 4400. Should run on much lower-end systems though. Uses OpenGL and SDL, comes with the SDL DLL file.