The Beginner's Guide revolves around the narrator who describes his history with an indie game developer named Coda and some of Coda's various projects. Often described as a "walking simulator", the game doesn't offer much in terms of gameplay, but in my opinion, the story and ideas it tells make it more than worth for the 1-2 hour playtime.
It's been years since I played it for the first time, but there are some moments that I still think about regularly. This is one of the first games I've played that really got me thinking about game development and how the developer can communicate to the player and create unique and powerful moments.