"Karoshi" is a Japanese word and means "death by overwork". In this game many things are not what you'd expect and the goal of each level is counter-intuitive: you need to die.
Your goal it to try to kill yourself.
Use the arrow keys to move, spacebar to fire your gun (you need to find it first. Press R to reset the level.
Play another game from Jesse Venbrus:
Super Karoshi!
