Nice design. Mostly easy pattern to read, tho a little hard to read parts.
I gave this a rating of 4, only because the way the pattern is drawn it's very hard to tell what color to use under the back stitches. The back stitch outlines on the pattern are very thick. I do like the color coding for the back stitches and that you can really tell where they go. However, I would recommend to make it easier, have two patterns - one for the main part and one for the back stitches. The back stitch one could be just as it is now. The other would be the same minus the back...