A few users have reported problems launching the game and this fix should solve the issue for all of you. Just follow the guide below:
http://steamcommunity.com/app/382260/discussions/1/357285562485871525/
If you still have any problems then feel free to post it on the discussion board here and we'll look into it:
http://steamcommunity.com/app/382260/discussions/1/357285562485871525/