Sorry for not replying quickly, I had a graduation party to prepare for

. I really enjoy the feel of this piece put have a few questions.
Why are you writing for quartet instead of quintet? I believe quintets are much more common and the inclusion of the horn would allow greater timbre possibilities. I love how you pass around the melody line and the addition of the horn would allow you to pass around the accompaniment figures. Also, the clarinet and bassoon can do more than harmonic percussion

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I don't know what type of sonorities you want in measure 10. My ears were confused by your break with traditional harmony. It's not that the sonorities you have built aren't usable, they just don't fit with what you previously stated.
The sextuplet figures in the flute don't make sense to me. You have them slured but with repeated notes. Do you want them to be tounged? Every other? Clarify your notation. Also remember that a computer can do things that humans can't. Possibly this passage could work flutter tounged...
Please extend the coda! It just doesn't sound done to me. Lots of V-I!
Thanks for sharing this piece.