I love your interpretation of using the window for gameplay! This a super cool idea, and it's really well executed too! The art and sound are pleasant, and the "holes" in the window were super neat. The main issue I noticed is the difficulty. The second level in particular took me a long time to finish, as it is really difficult to make the accurate jumps required using the bouncy mechanics of the game. Beyond that though, everything felt good! If you ever decide to expand on the game, I think it would be cool to allow the player to create/move the holes in the window to add an extra layer of puzzle solving. Nicely done!