Samurai Sword?
Well, it wouldn't exactly be called a samurai sword. Judging by your graphics, I'd say it was a katana. If you were trying to say that that boy was a samurai, he acted and fought more like a ninja to me with the whole jumpsuit, shurikens, and sudden surprise attacks from out of nowhere.
I don't understand how people get confused with what a ninja and a samurai is. It's like a comparing a hitman with a law enforcer.
Anyway, if this goes on as a series, it might be a rather nice and quaint Flash.