Really inovative game. I don't know how it's even possible to work in many windows and between windows, but you made it. Timer for every window is clever, but it can be exploited by selecting window with top fully filled with tiles. Character is therefore outside given window and not spending timer. So player can use the one window throughout whole game as a platform.
But that's just a small issue. Other parts of the game are well done, game looks great and of course levels make you think outside the box :D
Good job.