It has this floaty dreamy feel to it, something I do enjoy over a cup of tea and just before going to bed

Not always, but it suits my mood at this particular time.
Simple yet evocative, you have really refined your art to a piece de resistance, with this one. Where do you go next?

I could have mentioned 3-4 things I would have changed or added to the piece, but nothing important. Just maybe the possibility of having a recurring simple theme (4 to 5 notes / bar) that could be added to enhance dynamics?
The "dialogue" fits the soundscape well, and well-sung parts as well, Juli!