Congrats on your first polished game for a game jam! You did quite a good job, it definitely felt polished! At first when I saw that big bird in the background I was disappointed I couldn't shoot it, but when it came back later in the foreground as a bass it was very exciting! A small suggestion, I think it would feel even better if there was a sound effect when hitting a bird and if the particle effect was a bit bigger. It felt quite small compared to the size of the birds.
Overall, well done, solid game! :)