Tried the browser version.
Playing on the controller, and had no problems with it.
I like the character model, and the arcady idea of the game. Took me a while to get used to the controls. Got to wave 4 of the endless mode.
It was fun. The ecolocation was a nice idea. I ended up using it quite a bit near the end of each wave.
Make it clear that you can hold A to keep flaping your wings and gain speed. At first I thought I had to keep pressing the button.
I don't like how I gain height when I flap. I would rather just gain speed, and manually aim up if I want height as well.
Expand on the menus and visuals. Make everything as charming as the main character. Also give me more opportunities to see the untransformed version. She's so cute :D