Nice game i love the art and music.
I would ether change the combat or the way the birds fight cuz the birds were above me and then flew down on to me and i couldn't attack up so it got annoying or you could make the birds avoid the player until they get to the players feet and then attack but that would be more complex.
Also maybe put some check point after every screen or every other screen cuz it got very annoying replaying the same part over and over just to try one more thing at the last screen and then die it made figuring things out harder and not in a good way.
And one more thing THANK YOU for making the music persistent! i love it when creators do that, so many creators don't make the music persistent and it restarts every time i die or go to the next level i get sick of the song soooOO much faster, so ill give you a 5 star on that. Most people dont make the music persistent and its very annoying when they don't so its refreshing seeing someone do that!
edit: the sleepy guy is great! i like it