Considering that the victims didn’t seem to care that much about self-preservation until they were in danger of running out of replacements, but surrendered before they could be wiped out, it might count as zero kills.
Yes - most if not all of his stuff is worth a read, from his work on Swamp Thing, to books like Top Ten (my personal fave), V for Vendetta, League of Extraordinary Gentlemen, From Hell, etc…