Here is an overview of the game, via Nintendo.com:
The world knows you exist.
Experience an adventure game with puzzles that go beyond its own window and establish a unique bond with the main character.
In OneShot: World Machine Edition, you discover a strange computer operating system with a self-contained world installed. Explore this world to unravel its mysteries and help guide a child on their mission to restore the long-dead sun.
You hear that saving the world may no longer be possible… But it’s worth a shot, you think. Now with collectible content and features exclusive to the World Machine Edition!