A mobile browser game can feel native by fitting comfortably in portrait mode,...

https://www.first-bookmarkings.win/a-mobile-browser-game-can-feel-like-a-native-app-because-it-supports-portrait

A mobile browser game can feel native by fitting comfortably in portrait mode, just like many apps do. It loads quickly thanks to smart caching, so you spend less time waiting. Touch-friendly controls make it easy to play without frustration