How does your submission match the theme?
In RGB, the world is made of colored cubes. You can move through cubes which match your color, and besides movement, you can perform two actions : (1) changing you own color and (2) use your gun to change any cube color.

I designed RGB so that action (1) is linked to a maximum of things in the game : changing you own color will change how you perceive the level and how you will move through it, allowing you to see, move and fall through cubes matching your color. it also changes how you interact with the level using action (2) : your gun shoots projectiles matching your color, and any cube hit will change color to match yours. Finally, changing your own color also changes various visual and audio elements in the game, such as cube visuals, sky color, gun & projectiles color, gun sound and ambient sound.

As a result, each time you right-click to change color, you change most of the game.

In addition, the combination of action (1) and action (2) allows for a complete modification of the level, as the player can change any cube color and decide which color can be moved through.

This simple basis could be expanded by adding colored ennemies, following the same logic (you are immune to ennemies matching your color and they are immune to you), but this will be for another time ^_^

Thanks for reading, feel free to check the gameplay video on the game page. Any feedback appreciated :)

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Controls :

Movement : WASD / arrow keys

Jump : spacebar / right ctrl

Left click : shoot projectiles

Right click : switch color (red -> green -> blue)

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Third-party resources
Engine : Unity 5.6 (using standard assets : First Person Controller & Post-Processing)
Music generator : http://earslap.com/page/otomata.html
Sound effect generator : http://bfxr.net/

Contributors
XRNZ (Emmanuel Schmück)