Interesting take on the jam. Unfortunately, the next option doesn't cycle around, so I got stuck picking the last fighter. The game seems quite hard, I kept losing even when I got a strong character. You then have to wait quite a while for the battle to finish. The walk animation was quite slow. It would have been better if the battle ends as soon as your fighter is dead. It would also be fairer if the fights were only against 1 opponent at a time. You could then upgrade between fights. Luck appears to play too big a role right now.
The animations, sounds, music were all very good. I actually went and grabbed the music! I think with some extra time spent on it, your game could be really good.