Annihilator

Annihilator is a 1-player arcade game for the TRS-80 CoCo.

Hoards of funny little creatures have invaded the planet Val. The aliens are harmless, but you want to kill them anyway, just like flies. A new wave of faster pests arrive at the planet after you destroy the old wave.

The player controls a small vessel that can move in all directions, and fires directly forwards. A small map at the top of the screen shows the location of alien vessels. The player tries to shoot all alien vessels as they move about on the screen. If all vessels are destroyed, the player moves to a challenge with faster moving creatures.