welcome to YC for starters
just on first listen the form seems lacking, each independent section is quite enjoyable, however the piece as a whole seems aimless. also related to this fact, the overall length of the piece feels too long, I say "feels" because with more form to the piece the audience has something to aurally grab on to, and therefore it feels less long. aside from the formal issues, I'd say my main criticism is that the piece lacks clear phrasing, and bowing inferences. are you independently bowing all of the unslured notes? the accented syncopations, are they an up bow or a down bow? also, the (2+3+3)/8 is better expressed as 8/8 and beamed accordingly.
none of these things are at all unusual, and quite frankly the fact that you have written a piece of such length and scope is commendable to say the least, you have obvious talent and I look forward to seeing more as you develop and mature in your works. keep up the good work.