Designing a full-sized game for a five-inch screen isn’t just about shrinking...

https://nova-wiki.win/index.php/How_Do_Browser_Controls_Reduce_Usable_Screen_Space_on_Mobile%3F

Designing a full-sized game for a five-inch screen isn’t just about shrinking everything down. It’s about focusing on what matters most. Touch-first controls need to be easy and natural to use with one hand