So I've not downloaded it yet but I'm assuming the demo is rather lackluster?
Based on comments I'm seeing here there are a rather large number of issues this game has and few responses.
So I will go off the cuff based on current knowledge and comments.
It's not very typical for devs to leave a platform this far behind the current build version, this needs to be addressed if you wish to keep a revenue stream.
Generally it is frowned upon to have people pay for each update as you also have various other streams of income to compensate for this and quality brings customers, not greed.
With that said, the game looks beautiful on the packaging, but I doubt I'll even try the demo if the comments about it are to be believed, and a fair number of them all say the same things, riddled with bugs, very little content to judge the game by, and a lack of updates to an entire platform of the game.
In conclusion: Not Worth My Time.