A mobile browser game can feel just like a native app by supporting portrait...

https://eduardosnicechat.publishlane.com/posts/what-are-the-signs-a-browser-game-is-well-optimized-on-mobile

A mobile browser game can feel just like a native app by supporting portrait mode, so it fits your screen comfortably. It loads quickly thanks to smart caching, letting you jump right in without waiting