Hi, I just played this game, and I have a lot of advice on how to make better and scarier games in the future!
I don't know if English is your first language or not, but there's several grammar and spelling mistakes riddled in the game. If English is not your first language, I'd recommend getting a friend who is a native English speaker to check things over.
More on the writing, in the true end, it's not necessary to spell out what the main character did, and who "She" was. It's quite obvious, in my opinion. It treats the audience like they missed the whole story, which isn't the case at all. It would be better to put just a simple line like "I killed her. I killed my daughter." Something like that is short, powerful, and doesn't treat the player like they missed every bit of story.
The sound effects were good for the most part, but the jump scare noises don't really have the punch other sounds do.
It is my opinion that jump scares aren't scary and aren't needed in horror games, but that's my opinion. However, the jump scares that are in the game are laughable. The sprites for "It" are low quality, and quite frankly, look silly. The sprites for "She" are pixelated around the sides. That can be fixed by making the sprites bigger. (And always use png image formats.) Due to the other art in the game, and art I have seen on your social media, I'm positive you can make much scarier monster sprites.
On the other hand, I must say, I am impressed with the text box and menu customization you used! The sanity bar was also very impressive!
From what I can tell, you are just starting out, and that's okay! No one makes a masterpiece on their first try. I think with some practice, you can make truly terrifying games! I just wanted to give you some constructive criticism. Keep making games!