Don't worry, the game natively supports controller (outside of a few spots)! No JoyToKey is required!! :D
It's not clear what "native controller support" means.
I don't mind if a game forces its own layout on official Nintendo, Xbox, and PS controllers.
But, when it comes to generic controllers, I want to be able to choose my own layout.
If your game doesn't force layouts on generic controllers, I'm willing to buy it, and endorse it on conflexgames.com