Defend the tower as aliens are in full force of attack. Upgradable. Destroy as many aliens as possible and earn more credits to purchase/upgrade equipments.
A special Unit has been sent to Mars to prevent a looming threat. By controlling one of the combat robots, your Unit will have to go through the series of missions; destroying a mob of enemies, earning awards and improving your own robot.
In the far future, Earth is destroyed by decades of war for resources. The survivors build huge motherships and depart for a journey to the stars, yet the human learn that they are not alone as they encounter the dreadful..
