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

https://mega-wiki.win/index.php/Spin_Button_Too_Small_on_My_Phone:_How_Do_Designers_Size_It%3F

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