[Update: it appears as if only the tutorial is now available for newcomers without a key, with the rest of the game to come at a later date. If you need a key, I'm sure you can easily get one in the comments below.]
But for the two or three of you who couldn't get their hands on one, feel free to boot up Steam and just log in the game as normal. The only real difference is the fact that the intro plays before the game starts, so don't expect anything massive, as the game still isn't technically out yet.
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