What is the plot of the game Inside?

What is the plot of the game Inside? Inside is a puzzle platformer. The player character is an unnamed boy who explores a surreal and mostly monochromatic environment presented as a 2.5D platform game. The game is dark, with color used sparingly to highlight both the player and certain parts of the environment.

Inside is a puzzle platformer. The player character is an unnamed boy who explores a surreal and mostly monochromatic environment presented as a 2.5D platform game. The game is dark, with color used sparingly to highlight both the player and certain parts of the environment.
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