Be sure to make the controls a bit clearer. It took a while to learn the controls, and instantly I thought you were supposed to just put your cursor underneath the character and fly to the end. I would also recommend working on the ratios for the game, because in some levels the bar at the top is tiny and on other levels it's absolutely massive and literally covers the full screen.
Honestly though, the artsyle is really cute and the cover art is incredibly professional