All in all a fun little game.
I like the artstyle of your game. It's cute.
In my opinion the bloom from the star at the end of a level was a bit to high. (but maybe you wanted it that way.)
The ground had some invisible walls that made it a bit harder to push boxes around.
You're game would be a lot better if you would add some sounds and a little music.
Have fun creating games in the future.