I'm personally not the biggest fan of Python (largely because I generally dislike whitespace sensitive languages), but Ren'Py itself has been pretty nice to work with. It has its issues, which I sometimes have to work around, but all in all a great engine purpose-built for visual novels.
As for the horror tag... Unfortunately itch.io only allows up to 10 different tags, so I'm trying to optimise for tags that drive numbers (whilst obviously still being applicable to the game). If I recall correctly, I originally did have it, but it didn't pull the numbers the other tags did so swapped it out for a better performing one. I'd love to add it if this restriction wasn't a thing, but alas.