Designing a full-sized game for a five-inch screen is about smart choices, not...

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 about smart choices, not just shrinking everything. You focus on touch-first controls that feel natural in small spaces. Portrait mode often works better than landscape on phones