Brawl Stars is not officially controller compatible. However, you can still use a controller with some workarounds.
One way is to use an emulator like Bluestacks to play Brawl Stars on your PC. This allows you to map your controller buttons to the game controls.
For mobile users, third-party apps can help. On iOS, you can use Game Controller Apps. For Android, Octopus Gamepad Keymapper is a good option.
These tools may require some setup, but they can enhance your gaming experience. Just install the necessary app, connect your controller, and enjoy playing Brawl Stars with it.