I'd question and want to also ask, have you contemplated how the 'Full Games' saves system should work? How likely is it you'd decide between a save system where:
1) The game saves every time you sleep/wake up Only
2) To keep the saves the way they are.
If you were to do 1 - it'd increase difficulty 'and' horror/tension but not be F&H-levels of ball-crushing because 'you know where your bed is and its always a safe zone' like a Resident Evil typewriter room.
What are you thinking about it?