I'm afraid you missed the stylistics of Portal.R.Nevermore said:Then I'm afraid you entirely missed the point of Portal.
If you look deeper into the Portal world, you'll find that the clean and cutesy is a cover up for the twisted darkness that it's really set in. It's creepy, psycological and dark, and the comic did an excellent job at portraying the insanity, greatly assisted by the wild artwork.
The shift is built around the sterile clean "test chammbers" and the later contrast to the rusty inner-workings. Key words here: contrast.
It should be 97% clean and 3% pure accented and exaggerated insanity...
Also, CRAPPY artwork does not equal portraying insanity, it's just sloppy. Atsushi Okubo does a great work of fleshing out insanity in his Soul Eater manga with accents, eerie expressions and only rarely a complete Meltdown of art, which looks crazy cause it contrasts with the previously established "normal" artwork.
So this is just BAD artwork. Again, IMHO. And that coming from a guy who grew on Ashley Wood.