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

https://brookssniceop-ed.bearsfanteamshop.com/why-switching-from-wifi-to-cellular-breaks-my-browser-game-session-and-how-to-fix-it

A mobile browser game can feel just like a native app by supporting portrait mode, so it fits naturally in your hand. It loads quickly thanks to smart caching, reducing wait times after the first play