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

https://source-wiki.win/index.php/How_Do_I_Tell_Users_to_Update_Their_Browser_Without_Sounding_Annoying%3F

A mobile browser game can feel just like a native app by supporting portrait mode for easy one-handed play, using caching to load quickly even on slower connections, and offering touch-friendly controls that respond smoothly