I noticed the author is same now that you mention it but they have changed a lot of things from the novels and the artwork is the last thing on that list
If they gonna introduce our gas masked wifey in the next chapter then I'll be convinced that this is darker/gory version of psycome
This thing takes itself so seriously despite having an unbelievably stupid premise. I applaud whoever can maintain their suspension of disbelief while reading this, they must be a gold medalist of mental gymnastics.