Luigi's Mansion 3 is great but I dunno if 60 bucks great. If you are already fan of the series I'd say go for it, otherwise I'd hold off. That said, It is still absolutely worth a play if you can get your hands on it.
There are a lot of good indie games that work really well for switch. Dead Cells, Darkest Dungeon, Stardew Valley. Breath of the Wild, Odyssey, Mario Kart 8, Super Mario Maker 2, and Fire Emblem 3H are necessary purchases. Pokemon's good too