It should have been around the $50 mark
Agreed. In the end the question is: Will there be enough $100 pledges or would they get more than approx. 2.5 times as many people spending $50 to get the same money. We shall see.
The $100 pledges are pulling in more than half the total with just 44 people pledging at that level right now. So I think its where it needs to be.
Maybe an alternative $50 level where you just get Addams Family CE and that's it. And something slightly above that for the Pro version. I don't think that would be too bad, and would probably do good if you limit the backers to 100 each. Would be $10k right there if the 200 backer limit fills out. But may also pull some of the $100 backers down to $50 - guess it depends on how interested people are in the balls that modify the physics.