Cool design and idea. Maybe add description to the right puzzle for gates. I wasn't sure at first if having to stand on a button as the player was part of the puzzle or not - not sure how to get around that though.
Overall would be cool if the second puzzle was the whole game, have a few more sections of it for the player to learn how they work and make them more complex as you go on.
Left section was interesting with the colors and everything too, not much to add to that, other than that the two don't seem very connected. But that's Ok.
Overall, pretty cool, playable demo.