Reactor Defense: You are the last power source on planet Earth, but some aliens want Earth to fall. There is hope, though! Half of your shields are down, but that is enough. Press Space to pause the rotation of the shields. The red missiles cannot hit the reactor (purple), make them hit the shield. The green missiles are extra power for Earth, and you want them to hit the reactor for points. Also, if no power hits the reactor in a while, the power will drain.
