The first 5 measures, sound a little, too "harsh" to be a nocturne, but I think that's because of the soundfont you used. Try to consider adding some pedal on those measures.
I like your use of irregular groupings and odd metrics, that makes it sound pretty modern but at the same time very classical.
The end is misterious, to me it sounds like it should continue, i think it's because you made the bass stop with the last chord, but the melody still keept going.