The presentation is flawless: beautiful art, nice sounds, cool music... Nothing to change here! I'm less enthralled by the gameplay, I felt like the randomness of the enemy waves makes the difficulty a bit unfair at some times, and enemies shouldn't be able to shoot you when they're behind you and OUTSIDE OF THE SCREEN. I ended up playing with left click and right click held down at all times: why not make the shooting automatic? Also, maybe keep birds close by default and use right click (or left click if shooting becomes automatic) to spread them up, acting as some kind of dodge, rather than the other way around. This would reduce input I think, which at the moment makes playing the game a bit uncomfortable.
Still, for all my nitpicking this is definitely the most polished, ready-to-release game I've seen this jam, and I'm absolutely impressed by what you were able to produce. Great work, keep at it!