The problem with this campaign as I see it is the lack of far reaching and visionary stretch goals. The 2.2 million stretch goal is slowly coming about and then there is one at 2.3 million but what happens after that? To increase the amount of backers I think you need to have some more daring stretch goals at higher amounts of money to appeal to us to give more.
Look at how Wasteland 2 did it. They had some stretch goals pretty far away (right from the begining) that they finally reached. For exemple, "if we make 3 million dollars the game world will be bigger than Wasteland 1". And if we