Finally got around to watching these. Got through the Angkor chapter at this point. I must say, based on what you were saying in the other thread I expected you to be a lot harsher. But I think your criticism has been fair. Though I do think we might have different views on difficulty; I for one consider dying a couple times part of the learning process. That's not to say I don't get carried away sometimes.
I notice that you're using an earlier version; one where the monkeys' dying animation is still broken. An issue that's been fixed since. That also means that some of the problematic bits you mention have also been reworked since. But I've been terrible at keeping track of updates and versions.
If you want, I can send you an invitation to the Serious Sam Classics Discord server, where most discussions around the mod take place. People have been talking about fast monsters lately, you might be interested in reading that.