Very fun game to play! quite addictive as well! Beside the fact that it doesn't have any connection to the theme of the jam, this is a well done game. The MDA of this game comes well together, and offers a fun, highly dynamic holistic experience.
Suggestions: If you're going to limit the action into a small arena, make sure that the player has the space to move around freely, as reducing the parameters so much would become unfair.