Compositonallly, the track is quite strong. However…
IMHO, this track is lacking in dynamic contrast and, thus, sounds programmed rather than performed. Phrases have little, if any, contour to them. I don’t hear much difference in velocity within each phrase. This is particularly noticeable in the oboe at the outset. Oboists would shape attack, release and phrase, but the oboe here does little, if any, of that. In addition, each note is articulated in the same way.
I think this was rejected due to lack of realism. I think if you start varying velocity, expression and volume and begin to think like a performer, you will have a winner of a track here. Put this up against a real performance and I think the difference will become clear soon enough.
Good work. Just needs some humanizing.