Hello again @Marc Deflin! I am glad to see you're back at composing!
What I observed about this piece is that it's orchestrated very sparsely, uses lots of parallel octaves, with mostly sparse textures throughout. This means that your writing for the string quartet isn't very idiomatic (although it's adequate and playable and fine if you insist that that is the way you want to write). You never take advantage of the ensemble's potential for fuller, more richly voiced harmonies. With 4 string instruments, potential tutti chords in the ensemble can have up to 8 tones in them if the instruments double stop a chord.
You also cling to the key of C minor too much imo. You do use natural minor, harmonic minor and melodic minor liberally throughout the piece, but sometimes you have wrong sounding cross relations between notes, most often between Ab and A natural (like for example, in meas. 4, beat 3 where the Cello has Ab and the Violin has A natural). There are ways of pulling off cross relations like this to make sure that they don't sound bad. The way not to do that is to do what you're doing here which is; moving through parallel motion, descending from D down to an A. The parallel octaves on D establish a texture and put both instruments in the same voice treating them as a unity. You then immediately contradict that with the Ab/A natural split which makes it sound like the voices wanted to continue playing in unison but failed because one of them made a mistake. That's at least my explanation for why that didn't work.
At measures 26 and 28 your rendering is very poor and some articulations would have, I think, brought out more your intention of separated, repeated notes.
There's also the issue that this piece contains too many ideas that need to be developed further. It's hard for me as the listener to find connections between your themes. There's definitely themes here and you even do some sequential repetition to show that you know that you're working with a given theme, but the piece lacks a sense of a cohesive narrative. Those are my thoughts on your work. Thanks for sharing!