Pretty well implemented mechanic, would have love to see this fleshed out further. A small critique - don't feel the need to explain every facet of your mechanics to the player. Allow them to discover the nuances themslves, this is part of the fun of playing a puzzle game! For example, if you hadn't explained the "elevator" mechanic, it could have made for an introductory puzzle where the player needs to figure out the "hidden" feature. Other than that though, interesting entry :)