I enjoyed what I played and would be happy to see a completed version of. The main thing stopping me from getting completely into the game was that I was confused. I wasn't really sure when I could fly and when I was grounded, I wasn't really sure where to go, and I wasn't really sure what the controls where. The latter could be fixed right now by adding a paragraph to your game's page! As for the former two, I think changing the backgrounds where you can fly to be more obvious or having a visual cue on the player would help. I'm sure when you work on this more, there'll be NPCs to talk to (and maybe a map?) that'll give some more direction.
Please keep working on this! As I said above, I would love to see a complete version!