Our solar system is under attack by alien forces. We need to defend the planets with our advanced black matter asteroid guidance system. This system forms asteroids which can be launched into space. You have been chosen as launch operator to protect our solar system from eternal destruction. Space Defender,asteroid shooter,space game,mobile shooter,arcade game,defense game,black matter,alien invasion,solar system defense,strategy game,space battle,mouse click,mobile drag,shooting game,space,spaceship,defense,arcade,mobile