A mobile browser game can feel just like a native app by supporting portrait...
https://uniform-wiki.win/index.php/Buttons_Are_Too_Small_on_Mobile_%E2%80%93_What_Tap_Target_Size_Should_I_Use%3F
A mobile browser game can feel just like a native app by supporting portrait mode, making it easy to play with one hand. It loads quickly thanks to caching, so you don’t have to wait every time