Question about Alienware giveaway key's

If i am playing with the key i got from Alienware giveaway.

After the ALPHA is over the game will be revoke from my steam library?
i mean often some games after alpha or beta are revoking the game,
you will do it as well or you will keep the game ?

because i already played and have strong character.
and if the game gonna be revoke i dont see why i should continue to play?

btw only now i notice is on alpha and that why i asking for

The game is going to be free to play, most likely on the next big patch maybe couple months from now. So don't worry, you're gonna be able to keep playing the game.

That key unlocks the game. 

Once you have the game, you have the game forever.