Designing a full-sized game for a five-inch screen is all about focusing on...

https://ericksexcellentblog.image-perth.org/why-mobile-ui-design-is-more-about-priorities-than-shrinking

Designing a full-sized game for a five-inch screen is all about focusing on what matters most. It’s not about shrinking everything down but making touch-first controls easy to use and choosing portrait or landscape to fit the experience