Some things I thought worked well:
1. Pitch bend on the Koto notes to give some authentic sounding vibrato
2. Orchestration of the melody is kind of interesting, Violin + solo Viola an octave below, with a flute and then an english horn playing harmony according to a Japanese scale.
3. Counter rythm at the end with snap-pizz basses sounded pretty fiery to me
Anyway, I comments and suggestions appreciated as always.
EDIT: Thanks so much for the feature!