I bought the game to see how you implemented that. The game is 99 cents. Before the second(!) level, I am asked to buy a blade. Turns out

a) I have to buy money to buy a blade (WTF?! Either you charge for the game or the in-app purchases) b) I cannot close the buying menu without buying anything c) It is completely unclear to me how the practice blade is different from a "real" blade

You talk about how you detect players' intentions. My intention was to buy a game for 99 cents. Not for 10 bucks.

Seriously...