Place lasers, missile launchers, sniper turrets, and use combat strategies such as airstrikes and the space ray to repel waves of alien invaders in this sci-fi tower defense game.

Your planet is being invaded. We are receiving reports that sightings of up to 10 different craft are being seen in the skies all over the world. There is no evidence that these craft are alien, but we can't rule it out. You have been assigned the task of defending the planet and have been given access to 6 unique weapons to defend 20 tactical locations. Access to a direct line to HQ for orbital and air support has additionally been granted to help you fight off the hostile forces and save the day. The fate of the world is in your hands. Will mankind be assimilated?