After crash-landing on a lush planet infested by aliens, you find yourself having to repair your spaceship and fight off the aliens in order to get back home in this hectic mix of action and tower defense genres. Take control of the cute McDroid, shoot aliens, build up your base and defenses, harvest resources and make crazy sci-fi weapons, as swarms of alien enemies come at you, wave after wave, corrupting the ground around and even using your own resources against you.