well, it's certainly strange (for lack of better word) use of lemon tree song, mind You not wrong use.
It's certainly unique in some aspects (especially on NG), and considering I rewatched it three times in row I can hardly give anything but 10/5.
As for constructive criticism I can hardly say anything You don't know, (like improve on drawing). personally I don't like texts in animations (GOD,MILK etc.) but they we're not that much annoying.