Your movement from frames 500-300 is incredible. Not only your movement, but how you move uke aswell. I especially love the move @344-300 - it's so damn satisfying to watch. That said, the following bits are pretty lackluster. Allowing uke's hand to crash into you effectively killed the momentum you built up with that sexy ukespin, removing the possibility of a big ol' combo. During this collision, you seem to have lost your momentum as well. This all could have been avoided if you had refrained from raising your leg in frames 283-265, for it completely altered uke's momentum directly into you. Using a left hook to send him spinning into position for the kick was a cool idea, but again altered ukes momentum just a bit too much, slowing you both down. I feel like from the angle you decapped uke, you could have easily done a sweet boom instead.
With all the cnc out of the way, I thought this replay was fuckin GOOD for a new(er) ukebasher. Incredible progress, keep up the good stuff!