It's a really clever mechanic, and it's a nice touch on the pseudo tutorial to start the game! Definitely hard, and in particular, it feels like there's a cascading failure loop where if you ever stall out -> you don't kill fast enough -> more stuff on screen bumping the slow ball -> more stalling. If you decide to build out the concept more outside of the game jam, consider adding a recovery mechanic akin to screen-clearing bombs in shmups, maybe something that gives you a burst of free-spinning to get you going again that's also a pseudo-shield/panic button.
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Thanks for the comment! Yeah, in hindsight I should've added some way out of that state - maybe if small ricochets pushed the ball off a little faster so you can turn that into more spin or cap the number of enemies. Sadly the torture of a game jam is that I can only get feedback after it's too late to change, so oh well. :P