I really like the demo. Is this going to be a one time purchase all the way through?
Yes, it's one time payment game.
I saw a comment of yours where you mentioned there'll be DLC in the future for this game. Is that included in this one time purchase? I'm still on the fence of buying the game, I dislike in-app purchases.
Yeah, There are still 3 free DLCs and included in this payment.
