Zip Zap is a classic Defender style sideways shooter.
In Zap Zap you must stop the alien invaders by defeating all the waves of alien ships and saving as many refugees as you can.
Use the arrow keys or ASWD to move, fire using Z or M and pause with the space bar or by moving your mouse outside of the game.
When refugees wave at you from the ground, collect them and drop them off in front of the runway tower.
Watch out for abductor UFO’s who will try to steal your refugees and turn them into attacking cyborgs.