Is there controller support or is it just Keyboard & Mouse?
Hello! It's closer to no rather than yes in this case. All RPGMaker MV games support base joystick functions, but the real-time combat uses a custom input scheme. And this may be a problem.
If a joystick control is important to you, I'll say it's keyboard and mouse only. Real-time combat appears after some time in the game and it may take you longer than the standard refund system allows.