Keys:

American Truck Simulator (https://store.steampowered.com/app/270880/American_Truck_Simulator/)
Hidden Folks (https://store.steampowered.com/app/435400/Hidden_Folks/)
Gremlins, Inc. (https://store.steampowered.com/app/369990/Gremlins_Inc/)
We Were Here Too (https://store.steampowered.com/app/677160/We_Were_Here_Too/)
Old Man's Journey (https://store.steampowered.com/app/581270/Old_Mans_Journey/)
Steamworld Heist (https://store.steampowered.com/app/322190/SteamWorld_Heist/)
Okhlos (https://store.steampowered.com/app/400180/Okhlos_Omega/)
Project Highrise (https://store.steampowered.com/app/423580/Project_Highrise/)
Husk (https://store.steampowered.com/app/553960/Husk/)
Hollow Knight (https://store.steampowered.com/app/367520/Hollow_Knight/)
HITMAN™: THE COMPLETE FIRST SEASON (https://store.steampowered.com/app/236870/HITMAN/)
7 Days to Die (https://store.steampowered.com/app/251570/7_Days_to_Die/)
Resident Evil Revelations (https://store.steampowered.com/app/222480/Resident_Evil_Revelations__Biohazard_Revelations/)
Dead Island Definitive Edition (https://store.steampowered.com/app/383150/Dead_Island_Definitive_Edition/)
Sniper Elite (https://store.steampowered.com/app/3700/Sniper_Elite/)
Sniper Elite V2 (https://store.steampowered.com/app/63380/Sniper_Elite_V2/)
Hard Reset Redux (https://store.steampowered.com/app/407810/Hard_Reset_Redux/)
METAL GEAR SOLID V: THE PHANTOM PAIN (https://store.steampowered.com/app/287700/METAL_GEAR_SOLID_V_THE_PHANTOM_PAIN/)
METAL GEAR SOLID V: GROUND ZEROES (https://store.steampowered.com/app/311340/METAL_GEAR_SOLID_V_GROUND_ZEROES/)
METAL GEAR SOLID V: The Definitive Experience DLC (https://store.steampowered.com/sub/132479/)