I've browsed the category on Steam, but my eyes glazed over after about the 10th page of Unity walking simulators, anime schoolgirls, and RPG Maker games with default assets. I'm also looking for something that'll really get under my skin rather than casual action-horror titles.
Examples of horror games (both old and new) I particularly like to give you an idea of what might resonate with me:
- Silent Hill 2
- Lost In Vivo
- IMSCARED: A Pixelated Nightmare
- Clock Tower
- Five Nights At Freddy's (I might catch some flak for this one, but it was a genuinely clever and well-executed premise before it got memed to death and I'll die on that hill.)
- ANATOMY
- Stories Untold
Horror games a lot of people seem to like but I don't:
- Doki Doki Literature Club (it was a bit too anime for me)
- Amnesia: The Dark Descent (I finished it, it was okay, never really scared me though)
Alien: Isolation (double if you have VR)
SOMA is more psychological thriller than horror, but can be deeply unsettling if you're interested in identity or philosophy of mind.
Yahtzee's Chzo mythos is graphically very old school but damned good and also free.
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I've played SOMA, but I might have to check the other two out!