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

https://simonsnewchat.rivetgarden.com/posts/how-do-you-design-for-both-tablets-and-phones-without-breaking-ui

Designing a full-sized game for a five-inch screen is all about prioritizing what matters most. Instead of just shrinking everything, you focus on touch-first controls that feel natural in hands. Portrait mode often works better than landscape here