This has so much potential but needs more work
Some of the main features that I think should be in the game
- Characters can move freely around
- More voice acting from the characters
- A Story to the game (maybe you should actually make the karate kid style tournament with intro)
- Individual special moves that require different combinations for each character
- Some Cut scenes would be good maybe a short losing/winning sequence for each character.
There are heaps of more other things you could add as in different modes.
Personally I cant code my way out of a wet paper bag but you need to find a better coder if your really serious about making this game decent.