I made a gaming control panel using an Arduino Leonardo to play simulators. Currently using it for DCS World, but it should work in most games just like any joystick / gamepad.
Joystick Controlled Mouse with Arduino
Arduino Leonardo/Micro(ATMega32u4) As Gamepad/Game Controller : 8 Steps - Instructables
Zerk Zone - Arduino Leonardo Custom Joystick
Arduino leonardo mouse joystick control - Software - Arduino Forum
DIY Joystick Game Controller using Arduino Leonardo and Joystick Module
Joystick analogico con Arduino | ArduinoFacile
Arduino Leonardo pc joystick test - YouTube
A super smooth Joystick and Throttle part 3: wiring and software (with download) | rudysmodelrailway
Analoge joystick on Arduino Leonardo - Project Guidance - Arduino Forum