National Defense: Space Assault

Ready to repel the attacks of space aliens check only when aliens begin their movement. However, it is not necessary to tighten the protection of the planet, because the situation may get out of control. Develop strategic locations throughout the length of the path on which overtures waiting foe. Especially it is necessary to pay attention to the road that leads to your military base. For each killed enemy you will receive a significant amount of money, which can later be spent on improving the army equipment.