That's a very beautiful piece. I understand the Mozart reference, but for me it also sounds close to Schubert or Mendelssohn. And the plagal cadence at the end reminds of Brahms of course
I love plagal ends.
Not to say it's merely a copy of other composers. It's a beautiful piece that works for itself, even if the style isn't very "special". It's still a joy to listen to it. It's also a piece that I think would be very enjoyable to sing.