Chiptune and such are never my favorite sounds to listen to, but so now and then you find someone who can yield them well. I think you did an impressive job! It is especially hard to make the song represent birds, but I think the sounds you start and end with nicely represent gusts of wind. I love the transition at 1:27; just when I got a bit bored of the melody, you nicely transitioned away from it, and for a nicely long duration too (I often hear songs that make a transition just to sadly return almost immediately). Overall, quite nicely done :D