What a charming piece, thank you! Parts of it are a bit over the romantic top, almost trite, and would not be out of place as background music to a slushy movie. How did Bridge know what kind of movies we'd be making nearly a century later? But the overall effect is peaceful and contemplative.
What sounds oriental about it is that the parallel fourths in the opening and closing sections (and the occasional interjections) have a pentatonic feel about them.
Are they what you think of as suggesting snowflakes? I think "angelic" fits too.
I dug out the music at IMSLP and was at first a little disappointed to find that those angelic bits are actually hexatonic. In other words, they feature six of the seven notes of the (in this case E) major scale. But on closer examination, the angels are singing in a three-part choir in which each
of the three voices on its own is strictly pentatonic! Good old Frank was being very clever here. It turns out that there are exactly three possible ways in which you can omit two notes from any major scale to make a "normal" pentatonic scale (i.e. one having the spacings corresponding to the black keys on a piano), and Bridge uses two of those ways, one for the upper and lower voices, and one for the middle voice.
You say the title is meaningful to you. Is that because you're reading it as "Hart's Ease"?
I hope it's got nothing to do with heart disease.