You are a swindler.
You have lured people into playing a game, without letting them know that they have to PAY to finish it. So, you want to make a great flash game (which it IS) that you can also earn some money with? Fine. Just TELL PEOPLE that they will have to pay if they want to finish their play. Its as simple as that. LET PEOPLE KNOW UP FRONT. Otherwise, you're luring people in and swindling them of their time! Zero points. This deserves to be blamed, simply because of your dishonesty, wrought by greed.
You who are reading this, don't pay to progress in this game until there is forewarning, in the flash, AT THE BEGINNING, that a person won't be able to finish the game unless they pay. Don't let this guy continue to cheat people who can't afford to pay for what are supposed to be FREE flash games. That's all I've got to say.