A mobile browser game can feel just like a native app when it supports portrait...

https://wiki-room.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 when it supports portrait mode, loads quickly using caching, and offers touch-friendly controls. These features make the game easy to play right away without delays or awkward gestures