I am sorry to say that I won't listen to this piece.
It's a shame when you describe the "koto" as a "japanese style harp", and it's even worse when you write for the harp and koto when you don't know how to write for these instruments. Why don't you know how to write for these instruments? And if you don't know how to write for the harp and koto, then what makes you think you can write for any of the other orchestral instruments?
Since you wanted to write for the harp or koto, you should have done some research on the instruments before, see their use in other pieces, find out their range, their construction, how they are played, what kind of idiomatic techniques/notations exist, listen to different pieces involving the koto and the harp by different performers to get an idea of how they sound like, and above all, at least learn a bit more about the history of japanese music and the use of the koto in Japan (books on orchestration may be helpful with this kind of stuff).
So, I am afraid I can't bother to listen to a piece by a composer who hasn't bothered doing these least things to write properly for the instruments.
What's more, you only provide a midi file of your score and not the score itself.
Sorry if I can't be of any more help
