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

https://mylesssmartinsights.tearosediner.net/why-do-some-mobile-browser-games-feel-unfinished-compared-to-desktop

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