When it comes to horror games, Chilla's Art games will always be my favorites! There are so many of their games that I love, but if I had to choose only three, they would definitely be Parasocial (obviously!), The Kidnap, and The Closing Shift.
I think the reason I enjoy their games so much is because most of the horror revolves around humans rather than supernatural creatures. Somehow, that kind of horror feels much scarier and more realistic to me. (;▽;) I'm not really good at writing horror. Plus, I'm not that into ghost stories... mostly because I'm a scaredy-cat. (ಥ﹏ಥ) (I still remember crying because I got too scared to keep watching something.)
Honestly, putting Giyuu and Tanjiro into truly terrifying situations—like stalking cases or other realistic horror scenarios—sounds really scary to me. Human horror is always the scariest kind. Still, I might add those kinds of elements in my Giyuu and Tanjiro idol AU someday! I already have some ideas for it, inspired by Japanese idol culture.
Don't worry, though. I won't do anything like Oshi no Ko. I'm not a main character killer, hehe ( ̄▽ ̄;)