I'll be all over this site looking for feedback once I get to a more feature complete state. The design isn't set at all yet. In fact, I spent last night adding a jab and moving the current attack to being used as a Strong Attack. Once I add lives and semi-random levels, I think it will start to become a little bit clearer as to where the weaknesses are, what should be added, stuff like that.
The art will help a lot too, imo. It's crazy how big of a difference that can make. When I added the animations for the character and enemy, which had been simple boxes before that, it was like night and day.