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

https://romeo-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 all about prioritizing what matters most. Instead of just shrinking everything, you focus on touch-first controls that fit comfortably in your hand