Wow, what a lot of great feedback you've gotten already! Take to heart what they say; those that have commented have offered me great advice in the past, so I'd be obliged to adhere to their criticisms/thoughts.
So first of all, I love the atmosphere you've created. I love the language and your musical voice, I'm sure you'll have plenty to share with the world in your growth as a composer! You do a great job at adhering to themes and developing your musical content. I'm curious what you meant by this being a septet though? At first you say the oboe doubles the english horn, and the flute doubles the piccolo. Are they all meant to be played simultaneously? I think your piece would receive more attention and have a better chance of being played with a live performance if written for a wind quintet, but I'm eager to know your thoughts. With the advent of continuously more profound sound samples, you're instrumentation is fine, but again, just curious.
One thing that stood out to me is your phrasing. You have a constant eighth note quality to a lot of your melodic lines. As @Omicronrg9 pointed out, there were issues with leading tones, but I think a different issue you have with your phrasing is the "sameness" you have with the lines themselves in rhythm, regardless of melodic intuition. Yes, I know you vary it up in your harmony by giving some lines tuplets and such, but I think a more unique melodic contour would have benefitted this piece greatly. It's ok to think of a sameness in rhythm with your melody at first, but how can you further make it more interesting for the listener? How can you give your themes a bit more character in the wonderful harmonies you're creating, with a more distinct sense of rhythmic variety? Not saying you have to change anything, but this was my initial impression with hearing your piece. I had a strong sense of sameness throughout.
I would have liked to see a teeny bit more pushed dynamics as well. You do a wonderful job with your attention to detail in writing dynamics, but I feel like the instruments were never pushed to their extremes. How about register? You have piccolo and flute parts that could be VERY high and shrill. Your bassoon acted as the bass very well (just watch the range, I think the bassoon can only play the Bb under the staff, just looking at it's last note). You have a wide range from ppp to f, but were there any moments you could have gone to ff or fff? Perhaps not, maybe the piece didn't call for that, but just know performers love to explore their instruments, so don't be afraid to give them some notes to really shine through the ensemble.
Like I said before, I really like your musical language, and that's not something everyone composing can say. Many attempt to emulate their heroes, or copy what some other composer has done. You do a very good job at "pacing", giving rests here and there not only to let the instruments breathe, but letting the melodic lines rest as if they're being sung. It's very natural for music to be heard this way, and I hear too many composers writing obnoxiously long lines that don't seem human. Your phrasing in that regard is good, just always be aware of this as you continue to write and create music for the future.
I recently heard a flute player complain that every modern composer abuses fluttertongue in their writing. I don't think you fall into that category, but just be aware of extended techniques, as many people use it nowadays extensively. I think your use of it is just the right amount though, but just something to keep in mind. Not every modern composition has to be littered with a bunch of filler technique to sound modern.
So, moral of the story is that I really like your musical voice, which is something no music school, teacher, or conservatory can teach. You have great instincts, I just felt some aspects of the writing seemed a bit premature. I'm really excited to hear future works from you as you continue to evolve, and please be active on our site! You'll find loads of talented composers here willing to share their thoughts on your music, and even more if you get involved in our community! Most of the time, if you share a bit of insight into another's work, they'll be much more willing to give your music some attention as well.
Thanks for sharing, wonderful piece!