Move: A & D or Left & Right
Jump: W or Up
Double Jump: W+W or Up+Up
Use Guns: E or X
Use Ammo Dispensers: E, X or Space
Reload Level: L
Shoot: Space or LMB
Pause: P

An alien invasion has been detected. Aliens are coming in every direction and it's up to you to defend your base with your artillery. Show no mercy!