Considering the arts above and all the talk about fan-made version of BTTM, I think it can be made by using some motives of the original (like the ghostly pal, manor\estate\castle place and etc.). Some thoughts to share (maybe someone will find them appealing):
- your father (archeologist, historian, ethnologist) buys an old manor\estate\castle to investigate its history and soon leaves you a message where he invites you there. On arrival you find another letter with deed to the house and your name on it, and final message from your dad where he concedes that this place is far more mysterious than he first thought. So you start roaming this place to find clues of father's disappearance and also begin to restore new household (maybe main house, barn, riverside with a little shack and old tower).
- then you find evidence of a ghost sighting in the old tower, which can be connected to your father's case. Then it winds up like in the original beside the fact you are alone here, without your family and you have some time before they arrive. Now you cooperate with him but later you can side with or bend the ghost to your will.
- corruption of family members will be stageous with different choices that will affect desired state of mind about it (not like the culmination in the original but the sum of your dialogues and actions). States will branch (f.e. "passionate" state of mother can divide into "flamboyant" (which means she will successively do dirty things to you in the open and maybe join\invite other girls) or "possessive" (only you and no one else)).
- but you can do it not only by raising affection, you should learn some skills (just be silver-tongued or passionate or cunning or pleading). Also, involving supernatural theme, you should read some occult books in order to interact with the ghost (and will help you to bend him or to merge with him, giving you different powers and abilities - f.e. using the ring and summoning the ghost you can only mind-affect animals or humans with weaker willpower, however merging will provide you the ability to affect every living being. Bending (IDK) will give you some aura or mask that will make your natural charms more effective).
- oh, and also you can learn about the history of this place and ghost's past (like he has had very "close" relations with his female family members). You would learn how he fell to this, and I myself picture the last scene as he was imprisoned in this tower and his mother came down to see him. After they scarsely speak he jumps out of nowhere, clings to the rails and with the maddened look cries "Do you still love me, mother?" and she ran away in fear. And all of his frustration, pain, lust and hatred manifest as a trap and he becomes the eternal inhabitant of the tower.