While a good concept, I think using it for mobile games is kind of careless. Mobile games are fairly easy to hack and/or exploit, just like we've seen for Pokemon Go with GPS hacks. The system will be full taken advantage of and the legit players are the ones who lose in the end. The other issue I see is that if the coins actually possess monetary value and players are awarded based upon skill, there could be issues running into gambling laws. I'm not a lawyer or even a crypto expert, this is just my 2 cents.