hey man looks awesome. i think duellist demos have to be at least 30 seconds long though. this looks about 20 seconds
but yea, your form, timing, choreography etc is awesome. i think you would benefit from making the linework cleaner though, its kinda hard to pick out the features of your character because its so messy. again, great movements and form, linework makes it a chore to pick out whats going on with the character half the time. as an animator you make it your job to make sure the audience knows what theyre looking at without having to re-watch and concentrate hard.