Well, there's the multiverse theories, right? Where there's like, an infinite or nearly-infinte number of universes? So yeah, each one is one universe, but there's millions more!

... Oh! It's nothing, it's just- my dad's busy a lot with important stuff, being the mayor'nd all, and he says my traps and our mystery solving interfere with his job too much- drive away tourists in town, get on his nerves... It's fine, though, I know he still cares!

[Considering the fact that whether or not his father cares about him was literally never brought up by Satan, that overly-chipper reassurance is a little weird. Probably fine, though.]