Very cool idea! The bowling ball power ups are super neat too~ a magnet ball might be a cool idea (pulls pins back with it). Keep working on it, it's a fun idea for sure! Or if you are bored of the bowling concept, you could change it to like a wizard defending a bridge from hordes of enemies while grabbing different spells hehehe. Great job! Please check out my Hollow Knight inspired metroidvania when you can :D