Antichamber is an insane FPS puzzle game that relies heavily on abstract puzzles based on shape and color and unreal structures that might completely change on you if you look away from them.
The Stanley Parable is an interactive walking game where the player is narrated as they navigate the game. More a comment on the state of modern gaming than a full fledged game itself. An experience if you will, with fictional story elements and some small parts of interactivity.
A first-person horror exploration game set in an debilitated underwater research facility known as Pathos-II. Made by the creators of Amnesia: The Dark Descent, SOMA is a step away from jump scares and sanity meters and instead takes a philosophical approach to the horror genre.