A mobile browser game can feel native by supporting portrait mode, so it fits...
https://wiki-global.win/index.php/How_Do_I_Reduce_Memory_Use_in_a_Mobile_Browser_Game%3F
A mobile browser game can feel native by supporting portrait mode, so it fits your screen comfortably. It loads quickly thanks to smart caching, reducing wait times each time you play. The controls respond well to touch, making gameplay smooth and easy