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

https://wiki-spirit.win/index.php/How_Do_Mobile_Slots_Keep_Animations_Without_an_App%3F

Designing a full-sized game for a five-inch screen is all about making smart choices, not just shrinking everything. It means putting touch controls front and center for easy play. You pick portrait or landscape to fit how people hold their phones