Third Party Controller Support Is Not Good
I just started playing Sakuna: Of Rice and Ruin, and it's a really cool game so far. But the third party controller support is very bad. I tried to use my HoriPad S (USB Nintendo Switch controller) in DirectInput mode and it kept asking for button 15 for a lot of important things, like fast travel on the mini-map. And you can't remap some of the things button 15 is automatically assigned to. I played with my Steam settings and stuff to try and get the controller to play nice with Sakuna: Of Rice and Ruin, but my HoriPad S just wouldn't work properly.
My SIXAXIS PlayStation 3 controller works perfectly fine, however. I'm using it with SCPTool and it's working great now. But if you are having problems with controls on PC, you should really use a PS3, PS4, or Xbox controller and it'll work better. It might save you some troubles.