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Looking for the latest and coolest 3D and 2D Unity tower defense game? Here on vitalitygames we offer you our latest and exclusive game called National Defense: Space Assault. The game mission is to defend the Earth from the space invasion, you are Earth's latest hope, so do your best and defend the road that leads to your base and to Earth. There are waves of machines rushing to your base so build many types of towers to defend the road that leads to it. Your success is based on your money