Perhaps if you leave a comment on the actual browser game page, the developers can look into it.
I don't own anything IOS (it's just very expensive in my country, compared to Android and PC). So none of my browser games are tested on IOS. I would have no idea if they work - and I think that could be true for quite a number of developers. But if I had meaningful feedback, I could go back to the forums of the software I use and ask for help in solving the problem.