I used to play Yume Nikki, it's one of the more popular RPGmaker games. Ib was also good. I thought Witch's House was a decent one as well, they are all sort of horror-genred.
Here's a download for it: [link] Basically it's a horror game where you play a young girl visiting an art museum, and you find yourself transported to an alternate world where the gallery's pieces come alive and try to kill you. You explore the creepy gallery and come across two others who seem to have suffered the same weird experience, and together you all try to make it back to the real world. It's more about the atmosphere and puzzle-solving, so there are no real 'boss fights'. Just good story and good tension.
No problem, and neither am I, but it's pretty tame in terms of jumpscares or cheap tricks like that, but the atmosphere and story is really inviting and delightfully dark. I really hope you enjoy it! It has a lot of alternate endings you can unlock too, so the replay value is great.
Also, is there any quality COMPLETED games made with this program that you would recommend?