I was just cleaning

This is my first game jam! [Story] You are the monster in the demon castle, but you are not the mighty demon lord or any of those powerful demons. You are just house-cleaning ghost with no ability but to hide. Unfortunately, the heroes attacked the castle while you were cleaning. It was too late to escape, so you have to survive in the epic battle... [Objective: Survive!] The demon king and the heroes are in battle. You are so weak that you can be damaged by everything. (Even by the demon king.....