This was fun to play. Smooth mechanics, nice visuals, exciting music. The theme and limitation are both strong. Personally, I'd like a bit more of a backstory to explain why I can shoot bullets. Am I carrying a gun? Do I have magic powers? Am I spitting seeds at my enemies? You already have a little bit of worldbuilding (the idea that each Spring all the birds fight to be the king of crumbs), but I'd like to see a little bit more. You could even expand to some characterisation -- What is my name? Why do I want to be King of Crumbs? What will happen if I lose? But then I am a story-geek, so most of this feedback is just about my personal preference :) As I said, I really enjoyed this, so thanks for the cool game! :)