I like the repetitive arpeggios that are changed by the context of the melody notes below. Sometimes the arpeggios sound as expected - happy but in other places not as much. This gives the music an unexpected depth despite it's simplicity. And the strings add a great atmosphere playing (from what I can tell) open 5ths or natural harmonics or something. It's a great effect and the overall impression is very beautiful to hear. Thanks for sharing!