Sorry, but this is a real eye-sore and ear-sore. I appreciate the amount of effort it took to make all the illustrations and music by yourself, but... sometimes it's the simple, little things that can go a long way. For example, using a normal, legible font instead of this thin, scribbly one. Or finding a softer, less ear-piercing sound effect for when you hover over menu options.
Also, there's no shame in finding some free stock music to use in a project like this. I understand the desire to have everything in your game be made by you, from scratch, but having the entire beginning section of this visual novel be complete silence is very awkward, and makes the moments when music kicks in unnecessarily jarring.
The story is generic and predictable, though that can't really be helped in a game jam like this; people have to keep it simple because of the time limit. That said, there is one, specific detail that kinda irks me, and points to a lack of research:
"Ghouls" are not ghosts. Yes, they are sometimes described as "demons", but look up any description of them, and you'll find that they're overwhelmingly depicted as having a physical form. They don't possess things or exert a magic influence on their environment; when they lure people, they have to physically do it with their appearance and voice.
Maybe this is just a translation error of some sort, but part of me feels like you called the entity a "ghoul" just because it sounds more specific and unique than "ghost". But no, it is a ghost (or demon or whatever). Just call it a ghost.