Cool spooky game! It's hard to guess most of the things you must do because you can't navigate through the inventory.

Some tips: the limbs you can grab are maybe the most important items. Also there's a locked box, I don't know the combination but maybe it's in the 3 old books you can find or something. In any case it doesn't matter because you can just grab the items inside if you're lucky pointing them (try to crouch while aiming).