The bird vision was a neat way to have a really cool visual effect that was relevant to the gameplay too. The movement was neat, though a little clunky. Having A be both launch and flap might have made more sense. I did appreciate the controller support though.
Overall it was chill and I enjoyed flying around and exploring, but it got tiring eventually.
Oh, and when you pause it only pauses you, the rest of the birds keep flying around :) Also, it would have been nice if Start on the controller also opened the menu.