This is like the best sumo game I've played on the NES.
Good AI, feels like you can trick it. It could use variation in challenges and backgrounds, like a whole competition.
The art is good, the foreground and background especially. The player sprites are a bit muddy on my NES but you can clearly tell who is who.
I think there might be some bugs - if you go over 10 rounds you start getting tiles instead of numbers.
This was fun, thanks,