I'll Kill The Last Alien (Stack Smashing)

Try to get your enemy into your basket. The Blue player uses the up, left, right and space for movement, the green one uses wasd. Pressing space or d while in the air will let you stop mid-air, rotate and shoot at where you're pointing when letting go.

All of this is the ideal case. You will probably encounter numerous bugs. Just reload and try to have some fun. Or don't. The Alien doesn't care.