Xenophobe (Nintendo NES, 1988)

Emergency! Snotterpillers, Spiderions, Giant Slime Amoebas and other nasty, vicious aliens have infested eight of our space stations! As one of three expert outer space exterminators, you (or you and a friend in split screen action) are our only hope against these vile creatures.

Armed with a pulse gun, you must kill as many Xenos aliens as quickly as possible before the space station you are on self destructs. Some aliens hang from the ceiling, others jump, and still others hunker low to the ground. If you destroy enough of the monsters in a sufficiently short period of time, the space station will be safe, and you will get bonus points and move on to the next level. If you touch too many aliens and/or obstacles (such as alien slime and electrical force walls), your health meter will run down to zero and you will die. You can sometimes add to your health meter, your point total, or your arsenal by picking up an item after you kill an alien.