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

https://atomic-wiki.win/index.php/Why_Do_Slot_Games_Use_Big_Icons_Instead_of_Text_on_Mobile%3F

Designing a full-sized game for a five-inch screen is about making smart choices, not just shrinking everything down. You start by putting touch-first controls front and center, so players can easily tap and swipe