Creative and funny idea. Took a second to fully undersand how the tethering works but it was pretty fun once I got the hang of it. I wish the normal move speed wasn't so slow (I'm guessin you wanted to incentivize the grapple, but I feel it still could have been a bit faster.). I also wish the enemy sumo was a bit more agressive and used grapples too.
Overall really fun though! The lil sumo guys were adorable.