This game runs terrible on windows 10. Many other people also complained on the steam community about frame drops when there's textures on screen.
I didn't have any issues on steam deck though.
The only changes I made were mapping the left joystick to the arrow keys so I could use it for movement, and I lowered the default mouse sensitivity because it was too high.
I played the game a bit up to the point I could do a couple of battles with wild fairies and it ran absolutely fine.

The only issue I had otherwise was that with shadows turned on it will look really ugly so definitely turn off the shadows settings.