Tossing each other around with the rubber band is actually pretty fun, but I don't know what the point of all this stuff is. It's like they had this cool idea, so they decided to shoehorn it into a Sonic game that was about 20% finished at the time, and call it good. Knuckles still has the wall crawl which makes it unnecessary for vertical rubber banding, and I don't know what the spin ball rev is good for anymore. There are barely any enemies; you just try to get to the end with 50 rings so you can do the cool bonus stage. The stages are chosen randomly for some reason.
A good idea that was executed poorly in a game the feels like a beta at best.