I got up to round 10 by stacking tons of tiger paws and blindfiring my cue ball without any strategy lol
I would have loved to see more mechanics that built on each other for crazy combos, which I think you were getting at with the watermelon and triple-ball upgrades. Maybe spawning more cue balls or causing your cue ball to ricochet more could help, since those are triggered by contact with the cue ball?
Overall lovely artwork and vibe, I love that the shop is a shrimp in a vending machine 😌