In "Marcux: Medieval Alien Invasion", you take on the role of a blacksmith who discovers a crashed alien spaceship in a cave near his village. Upon donning the extraterrestrial armor found there, you unleash an alien invasion in the midst of the medieval era. Your objective is to fight against these extraterrestrial enemies to rescue your daughter, who has been kidnapped by these beings.

In this action-platformer game with elements of stealth and exploration, you will face different enemies and bosses, solve puzzles, and overcome the obstacles that arise in your path.