I made some shorter games that I can recommend, although not all of them are horror games
Oddrieta is not very long, has like 4 endings (I can't remember) and it's pure horror. It's the second game I've ever made and it's one of my favorites, although it never received much attention
https://avdossow.itch.io/oddrietta
Your Voice in the Autumn Leaves is not a horror game, but it's a very special game for me, since I came up with the story while I received chemotherapy and it reflects my feelings about cancer. It's very short and plays like a visual novel
https://avdossow.itch.io/your-voice-in-the-autumn-leaves
60 days till the world ends is a very strange game. It has some horror elements, but it's mostly a bizarre experience. It's one of my favorites and it's not very long. Most of the graphics are hand-drawn (by me)
https://avdossow.itch.io/60-days-till-the-world-ends
And The Grotesque and Pixelesque is a short horror anthology with multiple endings
https://avdossow.itch.io/the-grotesque-and-pixelesque
My favorite game of the ones I've made is actually Automagoria, but it's very long and it's more of sci-fi game than a horror game (it was also the first game I made and it took me about 4 months to complete it)