I hope that 20fps frame rate is because of their video concoction and not the final result.
DF did a video.... its mainly in handheld mode, that it has dips to the low 20 or mid 20's.
Otherwise it runs a solid 30.... (it plays better in docked mode, more solid fps there).
Still theres alot of sacrifice in graphics to get this running on a switch.
I think this should be played a on a PS4 or PC, if you have such.
Necro-bump this 2020: http://gamrconnect.vgchartz.com/thread.php?id=229249
Bumb in 2021: http://gamrconnect.vgchartz.com/post.php?id=9047071