The instruments are heavily afflicted with Machine-gun-itis. No round robin for your strings, mate?
I like the idea, mainly because it reminds me of the Curious Village (fuck yea Professor Layton), but the instruments themselves should be looked into; it sounds very "midi".
Also, it could benefit from some more expression, articulation, and dynamics. And spread the sound across stereo-wise; you can make it sound "bigger" that way, and take advantage of the fact that orchestras have each instrument in a separate-ish position.
p.s. What did you write this on?