Strong concept. I feel like this would very much benefit from having some light fantasy/theming applied to it (even if you just build an arena of ragdolls around that to cheer them on). The chaos is fun for a bit, to keep it fun long term I wonder what you could to actually make this feel a bit more strategic. Some rock-paper-scissor like counters would be nice. Also slowing the fights down a bit so that you can follow and understand the chaos a bit more could be neat for that.