Extremely ambitious, definitely has a lot of potential, with some polish. Though I understand this is a beta version, so hopefully that polish will come as the project develops.
A few things off the top of my head; I'd recommend looking at locking the mouse during gameplay as it is quite intrusive, especially in a horror experience, when the cursor is visible. Also the translation was occasionally off which would definitely be something that could be rectified, as I know a lot of native English speaking horror game let's players who have said they would happily look over a script for free. I would certainly recommend looking into this.
Overall what you have produced thus far is very impressive for an indie horror game and I certainly admire the the fact you have chosen to do a lot of different things instead of just producing a Slender or Five Nights at Freddy's clone. Really nice job.