Hey good game has a lot of potential. But if you add a competative element to it since it IS a fighting game... Maybe make it where instead of bar's as stats it's numbers, and we can create our own boxer which we can keep upgrading by winning fights and tournaments instead. You build up experience to upgrade, and use cash to help boost those up with stuff like armor, weapons stuff like that... If you don't wanna do the weapons, maybe the cash can be used to by boosters/enhancers that increase the over-all values of the statistics a character has.
Kind of a No-Limt type of thing. Add a leaderboard for the best fighting person too by their K/D Ratio's. Add an online-element so that people can type in gamer ID on the game to fight other players... Or they can fight the players by typing in their Placement Ranking. If the player is online they can fight... If not then the guy's user automatically auto fights a lot like the player.