THIS GAME IS NOT WORKING! You can play it, but it won't do what it's supposed to do. Use the arrow keys to move the shooter, press space to shoot. The aliens will slowly come down toward you. If they reach the shields, you lose. If you get hit by one of the alien lasers 3 times, you lose. To win you have to shoot down all the aliens, and I'm pretty sure the mothership a certain amount of times. I forgot XD
This is based off the original game.