Yeah, I've been thinking about starting the same thread. I don't expect we'll coordinate a whole lot, and I trust nobody would do something really rad, like kill off a major character, but it seems like knowing what everybody is up to would be a benefit to us all, and to the Players.
I admit it's a bit of a challenge to be real original, as the Spiffcode guys did a great job of running through about every possible scenario.
I tried to make mine have a bit more story, more dialogue, a bit more puzzle/thinking, and a lot less blowing things up. Not that that isn't fun, just trying to come up with different, after they've played all of your levels.
Mine:
Time setting: after the full game (probably everybody's is)
Main theme: Andy must go in solo to save another Mining Supervisor, who has been captured by militant radicals.
** Spoiler - if anybodys cares **
This leads to the discovery of a possibly huge underground deposit of Galaxite. I know this could impact the "Icarus World", so I'll probably have it be lost in the end...