I love everything about this game!
Every single aspect from art, music, gameplay and idea is completely awesome. That there is a beat on which the birds does an action, if it is jumping or dashing which could be easily expanded after the jam. Also the animations that feel so smooth, as well as the details like when in air the bird uses its wings to jump or the remenants of the dead bird when you die. On top of that is the on beat music and screen shake and the well structured world.
One of the best games in this jam!!!