Designing a full-sized game for a five-inch screen means focusing on...

https://holdensimpressivethoughts.lumenforgex.com/posts/pixel-density-and-ui-sizing-why-my-buttons-look-tiny

Designing a full-sized game for a five-inch screen means focusing on priorities, not just shrinking everything down. You start with touch-first controls that feel natural on a small display. Then you decide portrait or landscape works best for your game