I don't really have any horror recs, but can still rec a few fun ones. All of these are on Steam.
Valiant: Resurrection - Until I played this game, I never would have thought you could have a game around 10 hours that has really good world-building. Reminded me of Lufia 2 as well in some ways.
OH RPG! - A really unique little gem. Basically it's a short little game where you play as NPCs in a world where the heroes failed against the big bad and the world is going to come to an end.
Skyborn - You'll be shocked that this one is RPG Maker, because it doesn't look it. Really neat setting and while the story is nothing special, it has enjoyable characters and world-building.
Epic Quest of the 4 Crystals - Pretty funny little game and while it seems cliche at first, it ends up having a twist about halfway in that was interesting enough that I couldn't stop playing the game.
Greyfox - Really short and sweet little game that has a very unique premise.
Silver Creek Falls - a very nice little murder mystery game. First chapter is free so you can try it before you buy it as well.
The Deed - I haven't personally played this one yet, but I hear amazing things about it. Basically in this one you try to get away with murder.
I've also enjoyed nearly every game by Aldorlea and Roseportal games. Really the only RPG Maker games I've played on Steam and didn't outright enjoy were Secret of Magia and The Chosen RPG. Everything else was pretty fun and most of these are just the ones I enjoyed the most or in the case of the Deed are just really unique.
Re: RPGMaker Games
Valiant: Resurrection - Until I played this game, I never would have thought you could have a game around 10 hours that has really good world-building. Reminded me of Lufia 2 as well in some ways.
OH RPG! - A really unique little gem. Basically it's a short little game where you play as NPCs in a world where the heroes failed against the big bad and the world is going to come to an end.
Skyborn - You'll be shocked that this one is RPG Maker, because it doesn't look it. Really neat setting and while the story is nothing special, it has enjoyable characters and world-building.
Epic Quest of the 4 Crystals - Pretty funny little game and while it seems cliche at first, it ends up having a twist about halfway in that was interesting enough that I couldn't stop playing the game.
Greyfox - Really short and sweet little game that has a very unique premise.
Silver Creek Falls - a very nice little murder mystery game. First chapter is free so you can try it before you buy it as well.
The Deed - I haven't personally played this one yet, but I hear amazing things about it. Basically in this one you try to get away with murder.
I've also enjoyed nearly every game by Aldorlea and Roseportal games. Really the only RPG Maker games I've played on Steam and didn't outright enjoy were Secret of Magia and The Chosen RPG. Everything else was pretty fun and most of these are just the ones I enjoyed the most or in the case of the Deed are just really unique.