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

https://wiki-club.win/index.php/Why_Mobile_UI_Design_Is_More_About_Priorities_Than_Shrinking

Designing a full-sized game for a five-inch screen is all about setting priorities, not just shrinking everything down. It means making touch-first controls that feel natural on a small display and choosing portrait or landscape to suit the gameplay