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PA refers to Penny Arcade, a gaming culture webcomic that’s run since '98 that’s linked by Corngood up there. Tycho Brahe (besides being a 16th centure Danish astronomer) is name of one of the main characters in the comic as well as the pseudonym of it’s main writer, Jerry Holkins.
I also prefer the 2012 art to the modern style, but if Mike likes to draw the way he does now then good for him. He’s clearly demonstrated his artistic prowess over the years and I’d guess wanted to make his own exaggerated style. It’s definitely instantly recognizable as his