Great game and a great idea! Really liked the concept of the game, although I wish it was a little longer ^^ Some things that I noticed:
-Sometimes you can jump inside the moving platforms and become stuck inside them (especially in the last level). The game will also boost you upwards if you touch a wall of the moving platform.
-It's a little hard to notice where the transformation power-up appears. Some particle effects or another indicator of where it is would be cool, because you can miss the sound effect.
-There could be some improvements in the movement, but not that much.
I'm also very impressed by how well the AI of the fox works and how beautiful the art of the game is.
Overall, the game could use some improvements, but excellent job nonetheless!