A Hell Of A Time: In Hell you can play video games and do whatever you want, but you have to sing songs with all the lyrics replaced by "party".
Alternate Universe: where everyone has goatees. And the comic is run 'backwards', that is to say, the standard comic image is flipped before dialogue (and goatees) are added.
Alt Text: Used for comments or additional punchlines.
About Interacting Socially: This can be tricky! You want to be friendly, but you don't want to come on too strong. My best advice is to carefully observe others, and to relax!
Painting The Fourth Wall: God talks in BOLD ALL CAPS. The Devil meanwhile speaks in BIG RED LETTERS, and the raccoons and cephalopods ARE UNNERVINGLY ITALICISED.
Remix Comic: Technically, every strip after the first one; fan-made Remix Comics of it are, of course, also common.
Satan: One of the odder incarnations of the Adversary in fiction, he's a nerd obsessed with Video Games whose voice comes in from the bottom of the panel. Like God, he talks in all-caps without punctuation.
Also, when I started the comic, I wrote five thousand comics in one incredibly productive afternoon and have just been posting them one a day since then.