The game is really well-designed. It looks like you've been perfecting those puzzles for years, and mechanics in the core gameplay loop are fun, simple and understable.
I have two major gripes: Sense of progression, and controls.
The game is built for more lengthier beefy hard puzzles, and the time limit doesn't really help, I understand some stages are obvious and require quick reflexes while others are made to pounder on, and that's a good idea poorly executed. Character only moves in locked infuriating axis grid, with no ability to make quick turns and diagonals, which really damages any and all incentive to play shorter levels and go for stars, and making both mandatory to progress is a slap in the face. Not to mention the game is a bit bland and lacking in character, due to no context or any of that sort to your gameplay.
You sure are a good gamedesigner, other areas could use some work.