I loved the melodies in this piece, and I thought you did an amazing job at setting up the mood, especially with the great tone and use of the marimbas. I have a two orchestration errors I'd like to point out. To start, the first clarinets will not be heard above everyone else, even without the trumpets and horns. Double that on another instrument. For the trumpet solo at C, have the bassoon part in the trombones, or euphonium or tuba - keep the whole brass feeling. Finally, the horn glissando at the end should go on alto sax as well to add power.
Besides those small things, you need to state how many parts are on each staff on your score, I would have assumed you'd only have one trumpet based on the beginning among things. Also, state when each is to play by using 1, 2, a2, unison etc. Great work, 10/10