I have purchased this add-on on the 25th of march 2014. Just after creating the first quiz (a timed quiz) I did some quick testing and it seemed to work.
I then send the quiz to my 20.000+ members via bulk mail and a few hundred people made it. After that I found out that the results where not being counted correctly so I had no way of finding out who where the 'winners'.
I asked Mikey for support and really slowly but surely there was some support, but after a few weeks it went very quit and the problem remained unsolved. I have asked him 2 times when I was to expect the problem being addressd again, the 1st time I got a response, but after that I have never heard from him anymore. I looked like a nice add-on but all I got for it was $15 and loads of time wasted.
I don't know much about the technical issues. I just know that most other themes look fine on the iPad.
The xgame theme is useless to me since about 30% of my visitors regularly use a iPad 1,2,3 of 4.
It's extremely popular in the Netherlands.