Wonderful entry. Would also have totally fit last year's theme, with the player controlling the level, but clearly based on this years theme.
The story and ambiance was cute, but not distracting. All the different mechanics interacted in interesting ways, and were reasonably intuitive.
I was initially confused by how things worked. I figured it out a bit, but I think one more, even simpler level where the only thing to do was move the wall or floor could have introduced things smoother.
Very polished, overall, highly enjoyed.