Hank is an astronaut who has been assigned with a mission to build rocket launch pads on the moon. On his last day of work, the moon base is surprised by an alien attack, and Hank is caught in the middle of a battle of epic proportions, fighting for his life with little resources. In face of imminent destruction, the only chance for our hero to survive is to reach an emergency escape vehicle named LESS (Lunar Escape Systems). However, this will not be an easy mission.

Hank's unlimited single shot weapon can be either charged for a more powerful beam or upgraded to a double shot with limited ammunition by picking up a special power up. Limited grenade power ups are available as an special attack, and can help you fend off larger hordes of enemies.

An oxygen meter provides a time limit before Hank starts struggling with hypoxia, and should be renewed by picking up extra tanks along the way. Finally, Hank's limited movement is greatly enhanced by his attached jetpack that automatically recharges when idle, allowing the player to reach higher platforms or evade enemies.