I think it’s a very good idea! you did very well! so congratulations!
well, Some ideas of causes of rejection:
I would take care of some sensation of disonances in chords: 0:57, 1:12,… etc
you call this orchestral music, but I need more strings, more instruments, … more orchestration, because I can listen some tension in your composition, and in my opinion this must be well defined here, maybe some epic drums can help, and some string staccato and cymbals… don’t know.
Just my opinion.
But I think you did a big job here, it’s a great composition and I love it!