The pictures and the music are beautiful. As someone who does not have a very deep knowledge of music, I tried to understand why the arranger chose to choose particular images, or zoom in or out on an image, as the music progressed.
It made the music come alive for me and made me much more sensitive to the music. Every time I watch it (and you need to give it your full attention), I enjoy it more.
There are no characters in it, so the question about whether the characters are engaging is irrelevant but the images certainly are engaging.