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

https://tango-wiki.win/index.php/Why_Does_My_Mobile_UI_Feel_Cramped_Even_After_Scaling_Everything_Down%3F

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