I very much like the versatile use of the instruments. The piano starts out playing melody and chords, going to chords only and handing the melody off to a string section, going to arpeggios... it feels like every instrument is doing something rhythmic, something melodic and something harmonic at some point.
As was said before, your harmonies sometimes don't quite mesh (looking at the two measures following 0:44 - your cello doesn't have to play a line no other instrument has done in this piece before) and your acoustic space is very dry, a little bit more reverb should bring the whole thing together a lot more.
So basically, I have comparatively minor suggestions while your track as a whole is working really nicely for the intended purpose. Very well done!