This piece is compositionally indistinguishable from anything I'd expect to hear in the masterful works of say, Studio Ghibli back in the day, and such as, I don't have any point of critique to offer in that area. Fantastic work with your modalizations and keychanges.
My only areas of complaint would be a bit much whine on your high violas it sounds like at points. I can hear the synth, so to speak at points. The attacks are quite slow in places where that doesn't suit your piece, which bothers me as a classical musician (where all I heard was not to "twwaah" the attacks unless directed to do so). I suffer from this myself and sympathize. I may actually recommend swapping to a different library or patch in these cases. Albion Tundra and Spitfire Labs, as well as a lot of other kontakt libraries in that vein could be added into places where you need a sharp attack and sustain to match your piano, or you could back up the attacks of the individual notes some to pull them closer into those piano quarter notes.
For reference, I am talking about sections like 1:33. I think the violins may be a bit too high in the mix here relative to the piano, but that is because they are so high more likely than not.
I can't stress enough, wonderful composition. Evocative of exactly the feeling you describe in your title. Great work! Thanks for coming out to NGUAC!