Cosmic Commando

Cosmic Commando is a first-person shooter where you control a crosshair on a single screen viewed from an elevated angle. The aliens appear one at a time from the back of the screen and move downward in random patterns. You have to fire a certain amount to advance to the next level. When an alien reaches the bottom of the screen, it reappears at the top. You only have a limited amount of ammunition that cannot be refilled. The game is over once you run out of ammunition.