Parkitect will unlock on steam within the next hour.  Wherever you bought your copy of the game, you should now see the option to “Link to Steam” or to “Unlock on Steam”.  From here you’ll be given your steam key for unlocking Parkitect in Steam.  Open steam and log into your account and choose “Games” from the top menu and select “Activate a Product on Steam”.  Voila!  Exciting day for Parkitect fans!