Go here, scroll to the bottom and click download!
Remember, this is a game meant to be played with friends! Currently the game will recognise player 1 as both the keyboard and the first controller it detects. This will be fixed very soon, but for now it means that you need at least 2 controllers to play with a friend.
So please, grab a friend, a family member, a passing stranger, grab some controllers and play a few rounds in our demo level, Pyramid Tomb 1, game mode: Competitive Tomb Raiding. Let us know what you think in the comments below or on the Facebook Page.