It has a truely delightful feel
A subtle upbeat melody. Its actually pretty rare to hear one so well put together. I really is a delight to just sit here with this song open and playing in a loop.
I really don't think the piece needs more accompaniment as its rather busy as it for a subtle background song. My suggestion would experiment with the base on the cello part. Others are correct there is something missing in the lower range, and the end result is ... while not flat ... not as vibrant as it should be.