You mean RPG maker horror games, or just old school horror games?

It's called Ib, I found it to be alot like Ao Oni, also it's an RPG Maker game
download is below the image
jeneko.deviantart.com/art/IB-300952430

I'm working on a project on Doom 2 engine that is Ao Oni in a 3D world mansion remake of original game but I'm also planning to add more monsters such as Uboa, some creepypasta monsters and some more. They will have their own maps. Whatever, I released a beta of it but there's still problems that example Ao Oni can get stuckin rooms but when you think you're now alone, he can appear from nowhere lol

If you haven't tried them already, there are a ton of Korean spin-offs to it. Sadly not all of them have been translated yet.