I think that the movement system you used was very smooth and reactive. Also, the animation of the bird was amazing. I would maybe make the bee a little bit faster to make it easier on the player.
I really enjoyed the art that you used for this game. Also, the game was simple, but slightly difficult which is great. I wish that there was different items that you could collect.
I thought that this game was really well made and looked fantastic in the browser! I love the sound effects that you choose. The only thing id change is maybe making the bat go slightly faster.