I dig the concept, but if you're relying on player upgrades along with your ad revenue in order to fund payments, then this, unfortunately, is a ponzi. No proof is needed, except for the definition of what a Ponzi scheme is: "A Ponzi scheme is a fraudulent investment operation where the operator, an individual or organization, pays returns to its investors from new capital paid to the operators by new investors, rather than from profit earned by the operator."

I know that you have indicated on your site that you have purchased five years worth of dedicated hosting and domain registration, and I'd be very surprised if this HYIP/Ponzi site made it that long.