The game takes place in a futuristic world where players must fend off an alien invasion. Players are given control over various defense systems and must utilize them to repel the alien threat.
The main objective of the game is to protect the planet from an onslaught of extraterrestrial attackers. Players must strategically place defenses, manage resources, and respond to wave after wave of incoming enemies. With each failure, the attack gets stronger, upping the ante on the player's ability to repel the invasion. The game runs entirely in a browser, requiring no download or registration to begin playing.