Koops % doesn't have lots of tricks that usually we have in a Run(Such Cave Skip, Critical Glitches, scroll glitches), but it have Mummy quick Kill. Frank and medusa stunlock etc.
Its kinda rough get a sub 12 without all the tricks but its doable if you try hard enough

As much as everyone here said: Bat crit is a Frame perfect trick, witch means you need to do the trick in the right frame that the bat hits you inside 60 frames in one second... Emulator will always have some kind of delay but this doesn't mean you can't execute well the trick since your emulator always run at same frames per seconds(In Bizhawk supose to be 60fps). Unique thing that could bother you to do the crit is if you learn the trick on Real Hardware and try to execute this on emulator after mastery because of the timming to whip.

I play in Bizhawk and isn't about input lag, its about ur timming to press B dude. Try to find ur setup for that, a good visual cue for that i mean. GL with that.

Can i Record a Run offline playing emulator or do i need to Stream?
Its only a curiosity