It's a cool suspense game but one thing:
I think adding mental illnesses in that sort of context can be really harmful. Especially if you aren't informed enough. Them having OCD has nothing really to do with their creepy behavior and OCD is not about putting things away perfectly aka being a neat person/perfectionist. Some people can be really neat because of their OCD but the way they talked about it just makes it seem like you don't really know a lot and if you do it does give off the wrong impression of what OCD is like.
I would recommend anyone to rather keep it as a mystery in "horror circumstances" or use like a descriptive word that is not a mental condition like "yandere" for example which is someone being obsessed of a certain person. Just for the sake of not spreading misinformation i.e harming the community who already has to deal with a lot of wrong ideas of their condition and it wouldn't restrict you because you are kinda going with the flow letting you get inspired by x y personality patter or mental condition without trying to find an accurate word for it.
Well that's just a recommendation it's up to anyone what they do or not do with it. Either way i hope that i could've shared at least a different perspective
I know this game is not new but it was just important for me to say ^^
Take care