Simple
The game seems very basic. For me the computers keep on attacking each other without much success. The only reason they get out of bounds is because the ring is continually shrinking. Maybe a difficulty slider or options would make it more intriguing. As it is the enemies don't seem to use any tactics they just bump into each other constantly. Then at the end perhaps there could be a animation of a sumo wrestler wearing the same color belt as the winner bumping someone out of the ring. The only way to tell who wins is the voice at the end, but oddly enough the graphic seems to be the same regardless of color.