Chesire cat is exactly the kinda creature I was thinking about. I don't feel like the whole avoiding creatures thing would be a good idea either. It worked for Amnesia, but I don't know if it would be good for the game you're trying to make. Making it seem like a single creature stalking Mindy for whatever reason seems like a good idea.
You have an interesting point. I like what you're thinking and maybe Ramses can represent some kind of dark emotion or feeling, perhaps a resentment of some sort? It stalks her because it's always with her and she always feels that way. Another idea brought up from this is that there's a deeper meaning to each memory, which is why the current Mindy wants to preserve the house before her subconscious destroys it.