@bassjunkee but it is. You're paying not just for the game now, but for the final game.

http://steamcommunity.com/app/252490/discussions/0/630800446707803061/

"If I buy the game now, will I have to buy it again when it releases?

No. If you buy the game in Early Access/Alpha stage, you'll get the full game when the game releases. They are the same thing."