It seems like a really cool concept and I love the art style. As it stands though, there really isn't much here in terms of a game. I see in the description that this is only meant to be a concept, and in that regard you nailed it. The character controls well, things are animated nicely, you have a unique and interesting mechanic. All that is left is to add some stages. I'm not sure what you have in mind but I would love to see this cute lil mirror star in his own platform adventure, but with the game's mechanics I could also see this turn into a fun little multiplayer game where you're fighting over the light and have to take it back to your own colored light sensor to fight for the high score.
As it is a tech demo moreso than it is a game, I can only give you such a high rating. But I have faith that if you created this you'll have no problem turning it into a full game.