I immediately recognized the musescore instruments haha. I wouldn't use it for anything other than sheet music. I'd recommend exporting as midi and then using it in something like Cakewalk (which is free) or any other daw to make the audio itself.
Now to the soundtrack (with my opinion of course, like everything else is):
It sounds pretty chaotic to me. This is probably because every instrument tried to kind of play its own melody (like from bar 25 or 53 and onwards). Maybe letting the violin and viola only play chords would make it sound cleaner while still providing that "explosion" for the part.
I like the main melody tho. Very simple, which makes it perfect to use in a variety of places. I also liked the kind of instruments you picked, I think they match each other great (tho as said at the very top, if it's for exporting audio, don't use the musescore instruments).
I also liked how the melodies mix at the end, tho it got a bit chaotic as well.
Overall, I think this soundtrack matches the theme goodly.