As a Developer:
Gamecredits sounds like a great concept but as a game developer I have my reservations about adopting it. First as a Game Developer I'm interested in purchasing -whole tokens not satoshis or fractions. But if the price of a single Gamecredit cost $2 or $7 or even $15+ per coin I would not be interested in this coin as the cost of purchasing them would not be feasible to me. Such that I would want an alternative or want to build a team who could offer a more stable and viable alternative, for example Bitcrystals built their own currency that works for their game specifically, Linden did it too.
Why do you want whole tokens? That's entirely arbitrary. BitCrystals from Spells of Genesis are cool, but they will have the same "problem." Designing an alternative coin would just mean increasing the money supply.