Classical may not be my thing, but I'm leaving some comments anyway!
You've used a lot of strings in this composition, haven't you? While I'm not complaining about that, since the strings do a really good job at giving the track its full texture, I would have also loved to hear some brass or woodwind instruments in here. If you did put some of those in here, I'm not recognizing them. Without other instruments other than strings, your track gets a bit tiring to listen to.
But you make up for that with nice melodic content and a big, full sound pretty much the entire time. I like it! It creates a complex atmosphere worthy of the title "Voyage".
I can't tell you anything useful about your mixing since I'm an absolute noob at it but good job.
Overall, this is a solid piece fit to compete in the NGADM! Although I would have liked to hear some variation in the chord progression and in the instrumentation, you've accomplished a perfect atmosphere that makes one feel adventurous and ready to take on anything. Good job, and good luck!