Hi there! Just wanted to say that your GDD is one of the best among the ones I've read so far! The pitch drew me in immediately and I had a clear understanding of what this game could look and play like. The GDD is short and concise, and luckily you were able to include useful diagrams.
I think you're off to an excellent start! I like the idea of the house remodeled when someone new moves in and the ghost being able to possess things, but I felt that maybe your game could include a few more mechanics. Without getting too complicated, maybe the ghost can cause the lights to flicker or create a brief power outage. They could even make strange noises.
I think this game is unique, playable, and hope it becomes real!