Designing a full-sized game for a five-inch screen means focusing on...

https://www.bookmark-jungle.win/designing-a-full-sized-game-for-a-five-inch-screen-isn-t-about-just-shrinking

Designing a full-sized game for a five-inch screen means focusing on priorities, not just shrinking everything down. You start with touch-first controls that feel natural on a small display. Then you decide portrait or landscape works best for your game