A lot of the popular ones are on this list and I can confirm at least half of them being great, so that gives a good chance the whole list is a good find. I've heard great things about LISA and Corpse Party. Misao is also popular and made by the same person who made Mad Father.
https://theghostinmymachine.com/2018/04/09/pixelated-nightmares-21-creepy-rpg-ma...
The one's I'd recommend the most are, aside from the one's mentioned in the jam description, are Ao Oni just to try it out since it's one of the very first. I didn't like the gameplay much but it is a classic of the genre. One of my favorite things to do as well is to find free horror rpg games on itch and try them out. The Scream Horror Jam had a lot of good one's this time around. Not all made with RPG Maker but still the same genre and some have the same style.
Happy Gaming!