The Old City: Leviathan
Everything else is secondary. 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. You progress through the narrative by simply exploring the world. The story itself is told via the musings of your character and, chiefly, the environment itself. This environment has been designed to be diverse, interesting, and meaningful to the narrative of the game.