[quote=@Bai Suzhen]
Interesting... Of course, we don't know what level actually does, or even have an IC way to know it exists..
[/quote]

Consider it experience points, and there's no real way your character would know his/her level. As for what it's good for, for now it suffices to say that if you want to explore the world beyond Paradise City and get to the bottom of this sci-fi adventure mystery, you want to raise your level.