I think the sprites and background art were really cute. The gameplay felt clean and fun. The puzzles were creative and got me thinking a little bit! I also thought that the level that you made was really diverse in the different kinds of puzzles it had.
My only critique is to allow the cats to pull the boxes and/or not be able to stand under the gates because there was this one part where I wasn't able to put the box on the pressure plate because it was stuck against the wall, so I had to use the box (and later I found one of the cats also worked) to keep the gate opened.