I love the slow addition of instruments as you grow your flock! Really beautiful and evoked a feeling of growing epicness in me. Well done!
Some notes: The clouds on the horizon make it hard to see flocks that are far away, and I didn't realize what the goal was until I accidentally made it to the oasis. Also, I couldn't restart or exit the game from the finish...
But I really liked it, and you made great use of dynamic music. Way to go!