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

https://trentonsexcellentthoughtss.evergrovio.com/posts/what-are-the-signs-a-browser-game-is-well-optimized-on-mobile

A mobile browser game can feel just like a native app by supporting portrait mode, so it fits naturally in your hand. It loads quickly thanks to smart caching, reducing wait times after the first play