Nice one Chris. You've got your tone well controlled and good intonation. Nice tune and excellent backing (which I presume you did yourself). Main suggestion would be to give it more of a singing quality by taking your steady tone an now giving it some inflection with dynamics, changes of timbre or some vibrato so that it adds colour and life. A simple exercise it to do another take with you singing what you would play on the sax which is likely to have a lot more inflection. I think you're ready to bring that into the equation.