In the game, players control a character wearing a black shirt and holding a sword to survive against alien attacks. If the character is touched by an alien, they die, and the game fails. If the alien is attacked with the sword, the alien dies; the more aliens you kill, the higher your score, and the faster the aliens move. Note: The sword will gradually fade, and only when the character's sword is red can they kill aliens. You can restore the sword to red by touching a bonfire. The bonfire intermittently emits light.