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

https://milosinterestingcolumns.huicopper.com/what-makes-a-mobile-game-interface-feel-invisible-to-users

Designing a full-sized game for a five-inch screen is all about smart priorities, not just shrinking everything down. You focus on touch-first controls that feel natural in small spaces. Choosing portrait or landscape mode depends on the game’s needs