Hi, I won a giveaway for this game on steamgifts.com and the giveaway creator sent me a key for the game via email.
The key is like 1x11x-1x1xx-x1x11 (1=a number, x=a letter).
When I added the key to steam I was told it was "Dwarfs DLC comp".
I guess it was a key for the "old" summer sale...