Galaxy Invaders

Galaxy Invaders is a clone of Space Invaders. You control a small ship which can move left and right at the bottom of the screen, and keep firing lasers at the crowd of aliens which flies above you, all while avoiding the lasers shot out by the aliens. Once all the aliens are dead, you get to the next level.

Occasionally, an UFO appears which releases a bunch of enemies that home in on your ship and fly directly at you; shooting the UFO provides a large score bonus. Sometimes the destroyed aliens yield powerups - these include: a "plasma megablaster" which allows you to fire a single shot that can destroy multiple aliens, a couple of "tachyon missiles" which can be fired in pairs at your whim, a "rocket strike" where a bunch of missiles appears at the bottom of the screen and flies up, a "time freezer" which slows down the aliens, "score" which gives you score (sic!), and a "shield generator" - the shield will protect you from one laser blast.