The house will shift when looking away. Some doors require colored keycards, (That later turn into colored skull keys) The music will shift slightly. You can go through mirrors to the mirror world. You do not have a reflection. You are assumed to be doom guy. The house is full of demons and doom2 enemies, the demon part is normal. It is like you have decaying brain that can't remember things. Sometimes the house will shift into other places. Some endings will have house fires.