>>336575946
The Bellows is free and kind of fun, but old.
Twin Peaks isn't really horror but it has a great atmosphere.
Pupil: Wandering, Organ Quarter, HL: Alyx, and if you don't mind dropping a decent amount, Dement are all cool. FNAF has a free VR recreation and the official game translated them all great. Or just wander VRChat horror tag, there are some real gems in there.