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

https://wiki-planet.win/index.php/Why_Touch_UI_Needs_Bigger_Targets_Than_Mouse_UI

Designing a full-sized game for a five-inch screen is all about smart priorities, not just shrinking everything down. You need touch-first controls that feel natural on small screens and decide if portrait or landscape works best for the experience