You know, I really love when a single-player game tries to act like a Multiplayer game in the whole "You can't pause" sense.
Because you know, when I'm playing a boss rush, I really want start to bring up an option to End game and not stop what's going on.
Thanks Dracula X Chronicles, for causing like three [tornado fang]ing deaths because you don't pause because the Boss Rush has a Multiplayer function for some unknown [tornado fang]ing reason and the single player mode of it has the same rules.