About the "You win!" message: i had it, but i just loaded the save, i couldn't don't continue playing it, i just were got a far away in the walktrough, but, it's OK, i started endless mode and got everything i had and even better.
I think I want to have a bigger discussion, probably on the forums sometime soon about how people feel about the "Normal" / Mission mode. As it is now... I personally think it's pretty weak - all you need to do survive X days, and the payoff isn't very exciting. My hunch is most people play Endless.
As much as I like the idea of having the game have more "goals" in it... I might just swap out the "Normal" mode for a basic "Creative" mode for the time being. BUT... wanna see what everyone thinks about it first.