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

https://wiki-wire.win/index.php/Is_it_Better_to_Build_One_Shared_Code_Base_for_Desktop_and_Mobile_Games%3F

A mobile browser game can feel just like a native app by supporting portrait mode so you can play comfortably with one hand. Fast loading and caching make it ready to play quickly, even on slower connections