Hello.
Tha samples made me come but the result is really raw.
The worldbuilding is very limited.
The characters are few and different.
The plot, though not original, could have become good.
The photos and gifs are well chosen.
As I was saying, the game is really difficult. You created many rooms for a certain level of freeroam/sanbox but, to progress in the game, we have to find the right location to see what is supposed to happen there, like in a VN. So visiting all the rooms in hope to see anything can become boring with time.
Outside the polemic, I really wanted to like what you did but it's too all over the place.
On a more general note, though the original autor asked you to stop using his story, you could definitely create your own world. Being inspired by a story/film/game/anime is a thing but you shouldn't copy it (even as a parody, you have to bring your own ideas). It could be a shame if you let all your work go to waste because of it.
So, create your own characters and your own story, I know you're capable of it. Just chose between sanbox and VN or at least make a system where we can see what we have to do and have activities to do in between/outside those programmed events. Not knowing what to do is definitely a bad idea.
As for the name of the game, either keep "The Mansion" in it or not but not alone to differentiate with similar games' names.
Good continuation.