Stretched

Metal Gear Solid 2: Substance

Players control Solid Snake and Raiden as they help unfold another convoluted Metal Gear plot. Enemies are your friends and friends are your enemies. Typical Metal Gear stuff. This is a stealth-based game. If you are sloppy you will die. *Insert Solid Snake joke here.*

Call of Cthulhu: Dark Corners of the Earth

Dark Corners of the Earth is an adventure game developed by Headfirst Productions. The game is set in the The Call of Cthulhu universe created by the author H. P. Lovecraft. Players control Jack Walters as he seeks to uncover mysteries and stave off insanity. Gruesome and terrifying scenes will cause Jack to hallucinate and inhibit his ability to function. If Jack's sanity is lost the game is over. This game focuses on stealth and exploration with occasional combat. Filet-O-Fishmen.

Evolva

Control a team of "GenoHunters" with the ability to mutate by absorbing alien DNA.

Killer is Dead

Killer is Dead is an action game that is no sequel to Killer7 or the No More Heroes series by the same developers, but shares elements such as violent action, a main character wielding a katana as the most prominent weapon, assassins as an important theme, and a cel-shaded visual style.

Incoming Forces

Sequel to Incoming. Fight on the side of the aliens against the human forces.

No Man's Sky

No Man's Sky's gameplay is built on four pillars — exploration, survival, combat, and trading. Players are free to perform within the entirety of a procedurally generated deterministic open universe, which includes over 18 quintillion planets, many with their own sets of flora and fauna. By exploring, players gain information about the planets that they can submit to the Atlas, a universal database that can be shared with other players of the game. Players get compensated in in-game currency every time new information is uploaded to The Atlas.

Yrminsul

YRMINSUL is a strategy game in a persistent universe where each combat is held in the form of a Tower Defence. Crush the forces of good!

America's Army: Proving Grounds

America’s Army: Proving Grounds (AA:PG) is a first-person shooter computer/video game created using Unreal Engine 3, and is the most current game of the America’s Army FPS series. AA:PG was released in open beta on August 29, 2013. The game brings back many features from previous AA games and stresses small unit tactical maneuvers and training to reflect the current day U.S. Army.

X-Men Origins: Wolverine

X-Men Origins: Wolverine is a 2009 action-adventure game loosely based on the film of the same name.

The Old City: Leviathan

From Steam:

The Old City: Leviathan is an experiment in first person exploration that focuses entirely on story. All that exists is you and the world. Set in a decaying city from a civilization long past, The Old City: Leviathan puts the player in the shoes of a sewer dwelling isolationist.