I hope the Switch can run Ori smoothly at 30 FPS. Doubt it can pull off the detail it has at 60.
An original GPD Win can run the game in the 40s to 50s range at 540p (video often shows lower than that due to the DVR capture).
For context, here's the same hardware running DOOM. Compare that to what you'd see on Switch.
I wouldn't worry about performance. With the tweaks a port like this would bring to the table I'm sure it'll hit 60.