I listened to this twice, and liked it more after the second hearing. Here are some comments, both pro and con, hopefully constructive:
PRO:
You build some really nice textures over your repeating ostinato patterns. There’s enough variation in these textures to keep things interesting and create motion. The changes happening around 2:00, 3:00, 4:30, and 7:05 are especially good.
The orchestration is colorful and makes me want to listen more deeply. There may be more there than meets the ear (which coming from me is a big compliment, BTW). If you’re willing to share the score, I’d like to see it.
The piece is pleasant and upbeat. Assuming that’s what you were going for, it’s successful on that level. There are some brief moments of darkness or potential conflict, but these serve to contrast with and highlight the brightness of the rest of the music.
CON:
While the piece has a lot of energy, the energy feels mechanical and not at all birdlike. The music doesn’t fit the title, and I think you’re actually doing yourself a disservice by implying that the piece is supposed to be representational or evocative. It doesn’t succeed in that sense, even though it does stand on its own as a purely musical thought.
The repeating ostinato patterns that work so well in the first half of the piece start to get tiresome in the second half, and the harmonic flow becomes blocky and predictable. The cynical voice in my head started wondering whether all those ostinatos were really the result of conscious artistic decisions or just over-enthusiasm for copy-and-paste.