You definitely were channeling Ren and Stimpy vibes for this, and tbh it fits really well.
Something about Joel saying "so i get PISSED" feels like it'd be exaggerated, but it's fairly normal as far as animation goes. Somehow this almost comes off as more funny and i can't tell why.
The only thing I'm not fond of really is the gore in the explosion, but that's more my subjective preferences--if it were up to me I'd've done it more exaggerated / cartoony just to distance it from gore a bit more. (But that's just cause I don't like gore.)
Best origin story.
(Also bless you for introducing me to Joel's AMAZING Ghostbusters album cover.)