Many Levels have been done and many of them have been seriously changed in the meanwhile. So an addition of a switch could be done. It would tactically enhance the game.
It exists in Candy Crush and Fishdom and probably many other games
Not all ideas are listed here. You mean the hand of the changing boss.
That has been suggested before. It would be nice if you could list all the ideas. Unfortunately, many are not on it. They are much more likely to be given away!