You are stuck on a spaceship that's completely out of fuel. You play as a man who's schizophrenic and you are trying to reach the fuel bay so that the spaceship can run again. The condition makes the spaceship unreliable. Monsters and strange entities keep appearing as you move through the spaceship. It is never certain if what you see is real or just a trick of the schizophrenic mind. Either way you must fight through the spaceship.

Each run creates a map so the layout of the spaceship is never the same twice. You move through rooms and corridors find items, along the way and come across shops where you can gear up before pushing into the spaceship.