They Came From Outer Space !!!

They Came From Outer Space !!! is a simplified version of Space Invaders. Each mission starts from the indication of the alien number to defeat. Aliens coming from the top straight to the bottom. Killed aliens drop an object moving in various directions. Caught object gives points or weapon power up, but can also hit the shield, causing it to fall. Contact with an alien and the falling shield or loosing all the shields takes one life.