It's an amazing game. You are a madman at design. There're many details that were done right:
+ You did a good job at letting the player figure out the next step. When they do, they get blown away by how orthodox it is.
+ Your ideas of using color are all creative and well-executed (you can do away with the color-blind mechanics, keep it simple, and everything will still be amazing)
+ Having to drag the handle of the brightness bar would burden the player, so you let the player control it with directional keys
+ None of the mechanics feel useless, even jumping and falling were tied nicely to the level design.
Shame, I'm not smart enough to clear the last level, but you are one prolific mind!