Quite good
It doesn't happen often that I take the time to finish watching a rather slow story like this. The whole feeling of it was well done and the music really became one with the animation.
The things I'd focus on if I were you are the tweens, especially in the start they kind of jumped over into eachother and perhaps character design, giving them both long black hair and almost the same wardrobe might be a bit confusing at some points.
Other than that I thought it was pretty well done