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

https://www.pfdbookmark.win/designing-a-full-sized-game-for-a-five-inch-screen-is-all-about-prioritizing-2

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 your hands. You choose portrait or landscape based on how players hold the device