Good Idea and the theme was very well implemented!
I had some problems when playing it though. After every level/restart it would shrink and not allow me to play normally and see the whole level. 
It just looks shrinked for me and then I can't see the whole level. In effect the buttons have weird hitboxes when I'm not in fullscreen. I tried both fullscreen-buttons but as I said, after every level/restart it just throws me out of the fullscreen-mode. Would be nice to fix that.
That aside, a great game!