This whole track sounds really sweet, I like it. The music box sound, with the strings and the piano sounds really pleasant. Though, starting at 1:50, the chords of the strings could benefit with a bit more clarity. It's quite hard to hear the individual notes played. :) The reverb on the percussion at 2:45 muddies up the mix a bit as well, as the only thing I can really hear clearly at this point is the music box, as it's sitting nicely in the frequencies.
I like the variation in the dynamics throughout the track and lot of the instrumental choices are quite nice! The brass at 3:12 onwards is slightly clipping on my end at times, though only a small amount. The fade-ins sound quite unnatural, but perhaps that was your intention :) it gives it less of a realistic sound and more experimental.
That's a really nice transition at 3:50! Haha I was just about to say I liked the birds tweeting, but realised I have my window open and can hear them from outside. That said, the atmosphere at this part is my favourite part of the track and leads onto a nice climax at 4:30. I like the addition of the choir on this part to build the dynamics of the piece up, but the strings still get a little lost in the mix.
Really enjoyed the outro! Very enigmatic.
Overall, quite a nice job with this and lots of things to enjoy about it :) great work SD!