Place your defensive units and prevent germs from breaking through the bowels to the organism, in this fun tower defense game. <br> Instruction: Mouse to play.

In this game you need to protect helpless Earth from giant asteroids and devastating comets using automatic turrets. The gameplay of this game is simple. You-ve got to purchase turrets and drop them on the orbit, aiming at the advancing space bodies. If you destroy an asteroid or comet then you...