Here is a capture
Do you have a roadmap plan for upcoming paid content ? 🙂
Regarding the screen issue : you're right if you want to support every screen size this approach won't work.
As a web développer (myself), I'd suggest you to think in a responsive approach rather than fixed heights , width and positions. I don't know how it works for mobile games development (don't know which framework or tools you're using), but I suppose at least an approach where you position elements "absolute" from the nearest screen border (ie from bottom and right borders for the buttons ), you should solve the issue for a big amount of screen sizes 🙂