Lag Studios' first-person adventure game where players traverse the 1000-room mansion of the cute ghost girl, Spooky; there they encounter disturbing specimens and various send-ups of classic video game horror and modern "YouTube-bait" horror tropes. Currently in Early Access, but free to play.
Layers of Fear is a psychedelic horror where you take control over an insane painter in his quest to finish his magnum opus. Heavily inspired by the masterpiece paintings from the past centuries, and the architecture and décor from the XIX century.
Absolutely horrifying game and a nod to Lovecraftian horror. Wish more similar games came out.