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.
10 Years After is a post-apocalyptic survival horror/ RPG by new indie dev Ten Tree Games.
Bulb Boy is a 2D point & click horror adventure about a boy with a glowing head inspired by Machinarium and Gobliiins. Solve puzzles, defeat wicked monsters, and learn new abilities to reveal the twisted tale. And don't forget to save your GRANDPAraffin and Mothdog from the frightening darkness.
Absolutely horrifying game and a nod to Lovecraftian horror. Wish more similar games came out.