*snip*
-Binary Domain (Semi-serious sci-fi third person shooter)
-Beyond Good and Evil (Classic story-centered stealth game)
-Dishonored (Atmospheric stealth game with the same art director as HL2)
-Star Wars Repubblic Commando (Classic Star Wars prequels fps)
-Psychonauts (Funny platform from the PS2 era)
-Dead Island (RPG with zombies)
-Dead Space 1 or 2, not 3 (Classic third person sci-fi survival horror)
-Call of Cthulhu: Dark corners of the Earth (Uncanny models and filled with bugs but hey, it's still a survival horror on Lovecraft stories)
-Nier: Automata (Avant-garde Philosophical sci-fi third person action game with wonderful graphics and soundtrack)
-Condemned (Criminal Origins and 2) (If you are scared of being assaulted by screaming homeless people armed with blunt objects in abandoned buildings this game is made for you)
-Metal Gear Solid V (Last chapted of the classic story-heavy stealth games that focus on war and its consequences)
-Metal Gear Revengance (Action-packed third person settled in the Metal Gear universe that spawned hundred of memes, Jack!)
-I have no mouth and I must scream (Classic graphic adventure from Harlan Ellison that explored the darkest parts of human psyche)
-Any of the Half-lifes, Portals, Left 4 Deads and Bioshocks (not sure if you have them already, I haven't saw them on your steam profile)
These are the ones you can find on steam, if you want to go beyond that there are also:
-The Legend of Zelda any of them (Do I really have to explain)
-Eternal Darkness: Sanity's requiem (This early Resident Evil styled survival horror paved the way for 4th wall breaking horror and despite not referencing them directly, it's entirely based on Lovecraft stories)
-Metroid Prime 1,2 and 3 (Classic sci-fi fps)
-The other Metal Gear Solids
-No More Heroes 1 and 2 (Wacky third person action game)
-The Killer is Dead (Spiritual sequel of the previous one from the same authors)