If you never played the original and this kind of game is up your alley, you won't be disappointed. It's a lengthy JRPG with all the things you would expect, and it runs fantastically on the Switch in docked and undocked modes. But if you've also just finished the excellent Fire Emblem: Three Houses and want something more substantial to sink into that features classic characters from the series, you may find it a little disappointing.
All in all, Dr. Kawashima's Brain Training is fun diversion of the Nintendo Switch that makes most of the brain's clever neuroplasticity component that allows you to improve your memory and thinking. While it is reminiscent of the original game, it does create a totally new experience on the Nintendo Switch, particularly with its unique control systems.