After I though about it, can't we make it a bit more... aimed? I'm not sure if we exactly know what we want to do. To be honest, I'm not even sure if that hub idea is good after I've been thinking about it. I think that it should be something specified, what we are exactly going to do because in other way it's really leading to nowhere. There is story already, and it's ok, but doing something like "let's make few random levels" isn't the best idea imo. The hub can stay... If it really has to, but first three levels should be:
-Intro, whole story etc.
-First level where you escape Carrotus
-Second level which will be that damn hub, or second level which will be some place to which you escaped, like big space station/suburbs of the destroyed carrotus city, something like that.
I don't think that it will work otherwise. But whatever, we can try, anyway that's also bad that we can't keep off people who didn't even read this thread from editing the levels.