Very fun game with a lot of potential. I played in browser (which wasn't recommended) and had issues aiming a little bit, but I was able to play. As someone that kind of hates birds, this was very cathartic. I love the animation, too. Very reminiscent of old-school NewGrounds flash in a good way.
Only issue is that the theme is underutilized, but themes are mostly there as a prompt, so if you came up with this mostly on your own with loose affiliation of the theme, more power to you. Nicely done. Would love to see this expanded.