Hello ComposaBoi,
I was meaning to comment on this a while ago, but procrastination really got the better of me(as is the case with too many endeavors). Apologize for my indolence.
I wanted to say that the last movement particularly touched me; the final full iteration of the theme is quite heartfelt especially after all the dissonance you've introduced.
My only real concerns lie in the 3rd movement and your harmonic writing for the fast sections. For the former, the violin accompaniment in the first section seems to overlap with the main theme at times. I would be careful about balance issues since it could prove difficult to discern the melody. As for the latter, Henry gave you a suggestion on this too, maybe you could try modulating to other keys, use secondary dominants or even apply modal mixture. I would also check a few part writing details, cuz some dissonances seem too jarring in the context of the work.(but it's totally up to you if you'd like to keep it that way)
Anyways, this is already quite well-thought out compositionally, given the fact that it's based on only a few themes. Your writing, in general, also feels quite personal, which is always interesting for me to hear. Consider me a follower