What stuck out to me the most had to be your excellent use of dynamics. For me this added a lot of depth and tastefulness that I did not expect from such a short piece. The phrasing in the oboe and violin parts are wonderful as well.
I only have a couple bits of feedback:
1.) I would suggest being careful with how high the violin & cello goes, as well as how low the contrabass goes. The reason I say this is because they are starting to reach the boundaries for their respective capabilities. I think if you were to have this recorded by live musicians (and I hope that does happen in the future, as it's a great experience!), it might be difficult to get those parts tracked depending on the individual players.
2.) I would've personally liked to have a seen a little more of a gradual decay at the very end of the piece. IMO, since you had quite a bit of time to spare, having the music fade out a bit before cutting off would have been a nice touch.
Just a few things to consider in the future! I really enjoyed your submission otherwise - keep up the good work :)