Fun puzzle game! I really like the art, the characters, the colors and the concept. The song gives an interesting atmosphere as well.
At some point, it showed only a few pieces (missing some) and I was stuck, so, I had to stop playing before I wished.
It bugs me a bit when I see pixel art images resizing, as the pixels resize together and break my "perfect pixel art" expectations. I know that is a common practice, so, I take it as a perfectionism of my side, nothing you should take seriously :D
I can't forget I liked the UI with the care to let users change audio volume. That's a nice care for the player.
Keep up the nice work, I will mark to follow up, in case you have new versions later on :D