I wasn't sure which parts were yours vs. assets, so I'm not sure what you want in terms of feedback.
I like the idea of the different perspective platforming. I think there's a lot of potential. Some things I was thinking about as I played is one thing that frequently messed with me was my inability to go under things. Some things like the guard rails, supports for building outcroppings, or benches was jarring.
The bird AI seemed pretty sweet. Can you talk about how you did that?
The attack works to hilarious effect. I'm not 100%, but I think every bird spawned dies whenever you hit the attack button. It was startling to hit one in front of me and then turn around and see 7 or 8 dead all over the street.
Overall, I think you have a great idea. I can see the potential the game has and hope you see it through. Good luck!