Will the Alpha one come with steam keys if we bought it form the humble store or will we have to wait till a later build of the game?
Probably Steam will be comming a bit later, not in Alpha 1 already. I guess there will be some kind of announcement once the devs have a plan on how to move on with Steam. You can also follow the following thread for details on how things are going on with the Alpha:
welcome aboard @UniZbish!
You’ll have the option of a direct download or installing through Steam. We’re still working out the details on Steam, so that may come a little later.
stay tuned, we’re getting closer to alpha 1 by the day!