There's bugging in it, somewhere near the end you accidentally (you're not to do that intentionally) edited out a DM. That happens when you edit a replay at the exact frame of the dismemberment. It messes up the rest of the replay, makes it spazz at the junctions of turns.
For the rest of the replay, good for a first, OK for a madman in general. You forgot your legs there though. It never looks good to have whole limbs unmoved, especially fully contracted, fully extended or held for a long time at a time.
Another common mistake you made was simply slamming uke against you, which is (supposed to be) less effective than active striking, and it looks bad too.
But still, as said, good work for a first.