Hi, Giacomo.
I would agree with this generally; the more the piece advances, at least up to the re-exposition and specially in the section starting at 50, the further it goes from the usual harmony shown in the prior passages. What does seem to be a constant here is the question-answer passages that stain the majority of the piece for its own good in the majority of cases, but I don't think this kind of feedback is what you're looking for so I'm going to try diving a bit deeper.
• After a 3rd listening (of the most up to date version of your piece you brought to us), I noticed that the "crescendo" you do from M68 to the beginning of M72 felt unsolved in the lower voices (image of how I view it below the whole text), so I thought that extending the off-beat to that measure and resolving it at the same beat the decrescendo from fortississimo to forte begins in the first violin might be a good approach towards making clear that this section featuring strong "fake resolutions" —one at M67, off-beat; another one at M69, off-beat too— is over and the more fluid passages that come afterwards take control of the piece for a while.
• As a recommendation that I applied to myself regarding engraving, and which was recommended by some teachers of mine, try to compress silences where they not be meaningful or useful for reading. For example, look at Vc. part in M78,79 and 80. There are many more like these throughout the piece, which suggest me loads of try & error made —and thus, that this piece might be everything but effortless, which I highly value— cause these uncompressed silences are often left by the notation software after modifying/erasing/adding stuff.
In order to not make this denser, I'll stop here and give some more superficial opinions.
• My favourite parts were the exposition (the whole, up to M50) and the passage that goes from M86 to M92. The ending section was also good but not as good as the beginning and the aforementioned section.
• The 4-5 bars preceding M86 didn't convince me too much, but I'm not sure why. Perhaps because you reached fortissimo too soon: already in M80 we have forte but the music seems to be building up tension from that point till M82, hence I would say the dynamics don't exactly match with the intention... Perhaps I would have begun a bit less loud so the point of maximum tension is successfully reached and better noticed when the last legato [M83B3 to M85B4] and only it hold the maximum loudness in comparison with the preceding two. But perhaps not, again I'm not sure :B.
All in all, a very enjoyable work (for me, specially in the parts I mentioned).
Kind regards,
Daniel–Ømicrón.