A game where you play as a helpful ghost, a new Reaper tasked with keeping the living out of various haunted locations so that an evil entity doesn't kill them.
Each NPC you encounter will have different requirements for getting them to leave, or in some cases you can simply keep them out of danger until sunrise.
Paranormal Investigators and other curious folk can use instruments to gather evidence on your existence. If they leave with any, it will only draw more people into the danger zone, so that cannot be allowed.
I have most of the groundwork laid out for the first map already, Malaise Mansion. NPCs will travel from room to room, as will the Inhuman Darkness, or whatever I end up calling it. It will require strategy, and a bit of luck, to keep everyone alive until sunrise.