I don't really have any criticism. I just wanted to share my thoughts as I listened the second time, because to me, this piece simultaneously plays contrasting elements really well! I get a similar feeling quite often (which I refer to as a "sinusoidal mood with varying frequency"). Though I generally don't listen to symphonies much (which is why I can't offer useful feedback), I liked this quite a lot!
I really like the introduction. Starts off a little ominous or uncertain, and then seemlessly transforms into something ethereal and happy (which to me reminds me of music that could accompany a character's first few of a destination in a fantasy story), and back again! The grace notes did feel a little odd to me, like a jazzy or humorous element, but that might be a repercussion of system-generated sound more than anything else.
Those contrasting elements continue in the next lighter section, and they still go together so well! The happier elements almost feel waltz-like, and the minor tones like a stumble or a hesitant step, if that makes sense. The Tutti(?) at 3:20 reminded me of a scene from HTTYD 2, again with that feeling of our character seeing a new and otherworldly destination for the first time. And then again at 7:04!
I thought around 7:50 it would fall into a despairing mood for a bit, but no, that optimistic voice is there again! I really like that because I'm particularly fond of pieces of art that aren't pessimistic (assuming my interpretation is somewhat right). That bit of percussion around 8:35 felt incomplete though, which I think could be developed more as it sound a bit like a metronome, though it also works to give a "pausing" or trailing off effect.
9:20 onwards finally started to feel tumultuous, as if the emotions our character has bottled up are starting to leak out, and yet the optimistic voice comes again. In general, I really like the melody of the woodwinds at 10:42 and the strings at 11:36, and every repetition or variation of it is like a spark of joy or some form of comforting epiphany.
I think around 12:50 onwards feels incomplete, as if it's either missing elements or is like a placeholder (relative to the rest of the piece), but the shift in the mood until 14:00 is a nice change! The melody I like comes again at 14:42 with its uncertain partner, nice, hehe. The ending is strong and turns sweet (I love the piano and the harp(?)), though it feels incomplete, as if something is unsaid.
Overall, it's a lovely and interesting piece. Thanks for sharing!