Spend more time!
Your game was awesome buuuut it had somethinng missing.
Sound... sound is important, at least a sound track and a lightsaber sound effect and a gush of blood when an opponent is cut.
Graphics... level up should lead to a new background or at least a flash of light and a sound to go with it. a variety of enemies also makes all the difference.
Extras... there should be pickups like "spare misses" or "saber speed up" etc.
The only limit is your imagination... dont limit yourself
if u decide to use the ideas then just flash my name in the credits lol so i knw it was i who motivated you!
good luck with this buddy! cheers