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

https://astro-wiki.win/index.php/How_Do_You_Test_Mobile_Game_UI_for_Thumb_Reach%3F

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