Almost perfect!
You shouldn't sell yourself short. A true artist recognises the mistakes within his or her work, and rolls with them. Sometimes what you may interpret as a mistake someone else will interpret as a work of art. I for one think it is a beautiful piece. There were a few iffy notes that made me cringe a bit, but I quickly forgot them in the simple beauty of this song. The song does have a sad feeling to it, but only in the way that one may think of friends or family who have passed and are warmed in the heart at their memory. Please keep making music good sir.