Thanks for playing, and especially thanks for recording it!
The Sun Cultist is the most obvious one, but there's actually 3 different aggy daggy reference faces the enemies can have!
Blocking is super strong atm, yeah. Enemies don't know anything about avoiding hitting each other, and the AI isn't designed for groups that large anyway (I'm planning for a run to be around 25 rounds in the finished game, and there'll be a lot less enemies since they won't all be lvl 1 mooks).
Dying in one hit when you're on the ground is intended, but it's not a decision that's set in stone. I'll probably try having it take a heavy attack to finish the player off, while light attacks just reset your knockdown timer (maybe let you block as well?).
Skimming your video, I don't think I saw you dodging when knocked down, which would definitely make the enemies' finishers a lot worse (my how to play section needs to be a lot better written because I don't think anyone's seeing that part).