Ben,
This is very nice.
Two small suggestions I might make:
1. If you started the opening soprano pickup with a Do-Re eighth note slur, it might have a touch more continuity with the beginning of the second half of the song.
2. I might suggest changing the first chord in measure 12 to a vii chord instead of the IV. It would prevent the V – VII progression. See attached suggestion.
I do love the simplicity of this piece.
-Lyndon
