I've done a couple runs of both of these, and I'm really enjoying the shorter length of these runs, it's a nice change of pace from doing longer runs like any%. Not sure how exactly we should time these because technically they both have in game timers.

Here's my run of Boss Rush

and "Small Fry Fight"

If possible, I'd like to request these categories!

I could maybe add those as ILs of some sort. I think that'd be more fitting than full-game categories.

EDIT: Screw it, I'll just add them as normal misc categories. We can use IGT for them as well, seems to be no problem.

EDIT EDIT: Note that I ticked the "Timer ascending" option for the Small Fry Fight category. The in-game timer counts down, so when submitting in the future, use the remaining time that the IGT provides. I think it makes more sense to do it that way. I already added both of your runs now, by the way.