The art direction is great, as the others have mentioned. From what I can tell, there aren't any cancels, so every move really counts. I'm curious to see where this goes.
I do wonder if this stands well enough on its own without the gun. Maybe it's too early to say for sure, but the melee strike, dodge move, and jump already create some varied gameplay. That said, the kickback on firing the gun in the air is a neat touch.