You can play Genshin Impact with a controller on Android/iOS using Rainway.
Controller Support for PC and Mobile | Genshin Impact|Game8
Genshin Impact 4.0 to introduce new controller features for PC and PlayStation
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8Bitdo Ultimate 2.4G Wireless Controller for PC, Android, Steam Deck, and Apple - Chongyun Edition (Officially Licensed by Genshin Impact) : Amazon.co.uk: PC & Video Games
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