At the state this game is in its not very good the idea is nice but the actual game is not great It definitely needs some type of feedback when you hit someone, audio would also be very nice.

Interesting Idea, I really like it! I just think you could have added some kind of visual feedback when a punch hit, also maybe some knockback? Also, make the newcomers come from all the directions, this way they wont stack up in one side of the ring :D

I like the concept, the control are a little underwhelming and don't feel super impactful, I think some sound effects could be nice too. That can be easily fixed with shorter animation for the jab for instance and a bit of screen shake and knowback when hit. 

There is a very nice talk about it called "Juice it or lose it" on youtube if you're looking for some simple ways to add that extra punch. (hope I'm not coming off to harsh, I like the game, it just need that extra polish to make it pop)

Otherwise, very original, the chaos element is definitely there when multiple enemies start appearing and fighting each other and keyboard mashing is always fun!

Cool game! I have a good time playing this one!