Nice job being the first one to finish the first round of NGADM ;-)
I like this, it fits your comments perfectly. It's like I'm going on an adventure! I feel like Link! Or something.
I like the choice of instruments. I really enjoy the reeds that sit on top of the mix and add this soaring feel to the song.
The percussion is subtle and well done.
Anyways, I have a few suggestions for improvement.
The mixing is generally good, but I would suggest to make the 'most important' instruments (in this case, the violin(?) that carries the lead melody) louder than the others. Right now everything is about equal volume, which makes it harder to understand the song without listening closely.
There's a minor mixing problem where you have the french horn at the same frequency level as the strings. I can tell you panned because otherwise they would clash, but I think that you should just remove it - or move it out of the clashing range. Same thing with the oboe(? I'm bad with instruments.) at 1:00.
The dynamic (volume) level of the whole song is pretty flat. I'd suggest to make the parts where you have transitions a little louder (with crashes or what have you). Like, you modulate up a key or two at the end, but the listener could almost miss it entirely because there's nothing in there to indicate a change is coming.
Last, it feels a little repetitive. I think if you fix the dynamic levels like I said before this will clear up a little bit because the song will feel like it's constantly changing. However, I don't think it'll fix all of the problems because I think the song is just too long for the number of ideas you have. This is an easy fix - just make the song shorter. I always believe that it's better to make the song a tad too short and have the listener press replay than have it be a bit too long and have the listener get bored.
That's all the criticism I have! It's a lot, but it's mostly easy to fix stuff, which is good. Nice work on the song, I liked it!