Good questions, it could be 50 times but probably a bit less, I like the last boss because these bosses where the floor breaks check plenty of dots which make them cool : many things happen on the screen, they're extra unique, there's a progression during the fight since the battlefield's evolving and you have to adapt to the evolving battlefield as well as a sense of urgency but the thing I actually like is that you've got multiple bosses which don't work the same.