The animation isn't very smooth, though it gives off the impression that it is. Sometimes it's clearly visible when the fighting stops or slows down. The fight choreography is decent, though very simple. You really need to work on making fights more interesting. Introduce more props, different fighting styles for the characters. That sword bit was tragically short and didn't really involve any strategy.
Try improving your animation and making things more interesting with more moves, props, fighting styles, etc. Maybe some different sound effects as well. Also, you don't need to add so much time of black screen to the end. Just keep at it!
