Thanks for the extra information on gameplay.
What about stacking?
Keith said none of the multi-balls stack. This is one of the frustrating things about Iron Maiden. If you don't know which modes are multi-ball and which ones aren't, it will be confusing as to why one minute you're progressing on a mode, and then the next, all that progress is obscured by some other thing you're doing.
One of the issues I have is I really like to know there's different available strategies. I don't like when a mode completely takes over everything else and you can't progress along other trees, because sometimes you might accidentally start a mode while you're trying to do something else, then you're stuck being forced to go in a different direction.
I notice similar problems with Deadpool - it's a fun game, but when you start a battle mode, it takes over a bunch of other things. It's hard to tell what stacks with each other.
Does JP suffer the same issues? How do you know what stacks? Or which things can be worked on in parallel?