It's sort of an ironic parody of kickstarter. People "donate" by simply purchasing it on the app store, just like you would with any other app, and thus they g

It's sort of an ironic parody of kickstarter. People "donate" by simply purchasing it on the app store, just like you would with any other app, and thus they get the game (immediately). And they are saying that they will add other features to the game if the revenue exceeds the target.