This is a quiet, restful, simple canon. I also have a version based on 5ths, which I like more, but the poor pianist would be playing 9ths only, both hands.
Eventually, one the versions, including a triad based version (much longer) will become part of a larger work. No pedal, no rest in this piece!
I like this a great deal, Richard; the rich resultant harmony in it
distantly reminds me of Debussy's La Cathédrale Engloutie.
On the matter of the fifths version, I don't think I would
necessarily shy away from it because of all the ninths. Many
pianists can easily reach that. Even able pianists who
cannot are generally quite good at "fudging it" with almost
imperceptibly quick leaps -- though it can be tiring in a long
piece. In a shorter study, I think that would be quite