National defense: Space assault - defend the planet from the alien invasion. Build towers with high-tech weapons to destroy your enemies. Save the Earth from evil aliens in this game for Android. Aggressors are attacking different cities using powerful war machines. Place towers that will continuously shoot on their way. Get award for each enemy you kill and get new towers. Upgrade weapons on your towers to defeat powerful bosses.

Operating System: Android Froyo (2.2) or later