The backgrounds were stunning, and the art all around was really great.
The gameplay was also super interesting with how you could get ahead of the scrolling screen while walking but not while flying, which lead to interesting strategy.
But, hoo boy, was this hard. that second to last level took me a good 15 minutes.
Also I think a fullscreen button would be helpful, I ended up having to scroll up and down quite a bit.
Awesome game!