I like how you are using the instruments in a varied way, like the low piano being played at least in part for the slightly out-of-tune sound of the low piano notes. 

Between 1:45 and 2:00 you are modulating to a different key and that felt kinda not needed at that point. The music was not overstaying its welcome, you did not repeat prominent earlier phrases in the new context... it felt like an exercise instead of what the piece called for. The music after 4:00 seems to have little to do with what came before it, other than the instrumentation, I think, a little more callback to the earlier sections would make it more reliably identifiable as part of the same piece.

Besides those minor gripes, I would love to hear something of yours played by an actual orchestra. 

(Submission 19/29 - "Together, Our Time Becomes One" by Noz)

I got so lost into your music while listening to it that I genuinely forgot to write anything down about it as it played. Absolutely mesmerizing! I love your usage of dissonance throughout the composition.

I have some feedback:

Similar to what doost said, I think that mixing will definitely help. especially by increasing the master volume using a compressor / limiter / soft clipper (if you need). I had to turn up my volume up around 66% higher than what is humanly reasonable (yes i did the maths). Because of this, the instantaneous shift at 4:00 actually scared my boots off. I get what you were trying to go for: a sudden discombobulation, and I think that's fine. Just not when I have to lower my already increased volume down 16% and when I've already gotten used to the more peaceful sections for four minutes.

Despite this, I think your composition skills are fantastic! I loved it!

holy composition i enjoyed this. really cool.

feedback: i know you dont work in a daw but a little bit of mixing could really help your stuff. just a compressor and a limiter can really pack the sound together so the quiet and loud parts dont jump around.

i really like the whole journey and all the places the piece takes the listener. but as the track goes on i dont feel like this could belong to an end credit scene of a game. listening to it makes me feel like it’s made for a certain scene of a movie. idk maybe it’s because it’s classical.

idk how Sibelius works but controlling dynamics of each instruments is essential, when some of the notes are being played and they hold and they dont change expression/velocity much, it feels a little unnatural. with a daw its pretty easy.

basically im saying with the type of skils you have, get in a damn daw.

anyway hope that helps. wish u the best.