This game definitely has some good ideas. The upgrade system is cute, and fits the character/game.
Aside from that, I had some issues with the different levels of difficulty. For instance: the path to the wing upgrade is incredibly more difficult than anything before that. I felt like I had to fight with the controls a bit before I could actually move around as I wanted to; there's a bunch of upgrades that all do different things and are assigned to different buttons as well, making it a case of memorizing a sequence of buttons rather than 'performing the actions'. Once I got the hang of the controls, I felt a little more in control of the game character and I started having fun again.
Charming little game for sure. Nice work on this!