Hello!
I rarely comment because I'm just a newbie and always feel like I should keep it shut till I grow up, but since you asked me to have a look, I'll give my (very very) humble opinion 🙂
Disclaimer: orchestral music is way too complicated for me (I learned that after writing a terrible orchestral attempt :p) so I'll only be able to give very vague feedbacks about how I felt about the piece without getting technical). Also, the score is too small for me to read, so I'll really remain super vague 😞
I feel like the similar motion of the parts in the beginning is kinda killing their independancy (duh). What I mean is that it is striking to me because I usually like the effect of parts coming in one after another as I see on your score, but I couldn't hear this effect at all here because they are not distinct.
The melody in this opening is quite surprising. Overall, it just feels like an ever-descending motion. Not unpleasant tho, It depends if it's what you're going for.
I found the ending of the first part super abrupt. The final chord in forte with the brass came in a bit abruptly, and doesn't sound conclusive to me, but sounds like there should be something following it (unfortunately I can't read the score so it's just what I feel from hearing it, might be partly due to the crescendo effect), and then... an awkward silence comes in. This part sounded very weird to me, I felt it didn't flow well.
Then, in the second part, I had the feeling that the different instruments were quite dissonant with each other? and the rythmic placement made the tempo confusing to me. Well, it gives a lot of tension, but also doesn't sound quite right cause it goes on for long. then it comes back to a very thick homophonic texture where all the intruments play the same part (or so I hear), as in the beginning. Some violent changes of dynamics as well.
I liked the next part with strings and glockenspiel (I think it's a glockenspiel?) even though I heard some chord changes that felt too abrupt
All in all, I hear some ideas that I like, definitely. But I mostly feel like you still lack the proficiency to deal with a full orchestra (don't hear what I say as condescending; again, I'm much greener than you in music composition so no offense). I really think it would be better to get a solid grasp of much smaller ensembles first, because I do feel like you're getting lost in the possibilites that an orchestra has to offer so far.
Again, take everything I said with a grain of salt. More like a big bag of salt. I mostly have no idea what I'm saying, just giving my uneducated feeling here 😄