This is pretty! Thoughtful piano melodies and some really nice orchestration to support it, adding just the right amount of motion and aural intrigue to keep it engaging. As others have noted - the key changes really do elevate this to another level, turning it from what could be a kind of monochromatic journey into one that is laden with all kinds of color.
I like the use of the different string articulations to add some spice and variety to the palate, and the use of the orchestral percussion throughout is well done also. Progression throughout is really nice as I've already mentioned, and I love how the end of the track has just a little bit of tension and unease woven in; perfectly befitting the 'First Flight' concept, and thus executing on the theme really well.
This was a blast to listen to, and very well developed. Produced and mixed well, interesting throughout and with some memorable melodies and strong voicings. Great work - this is really good!