I played the demo version and liked it, so I bought the game and proceeded with it, but it continues to play as a demo...
The game is still in development, but from what I have seen, paying for it gets you every future update for no extra cost. The only reason it plays like the demo is because that's the extent of the game as it stands.
Exactly! Also to add, the next update will have upgraded models and such from the get-go. So there will be a glaring difference between the two soon.
