You've got some stuff going on there, work on making your strikes hit fluidly and try not to dismember yourself. In 12, you could have make that a very powerful kick with the other leg after the grab and in 11, you could have split uke rather easily.
In general, clean it up a little and edit frequently. Try new things.
Try (what I like to call) buffering, building up power for your next strike RIGHT BEFORE the previous one, this makes for a smoother replay.