Cute! The music works well with the gameplay, and it's clear you put a lot of thought into the different obstacles. I think you did a great job picking a screen capture for the game icon too -- very intriguing!
Is shooing away birds the only way to collect more pulse energy to make more hearts? That was a bit I was confused with, since it seemed I had to wait until a bird landed and was holding on to a pulse energy circle before I shooed it to ever collect more energy.