Got kind of sidetracked by other games and hadn't been able to fully appreciate this. As the biggest Mario fan I know of, I think that this is the Metroid Dread of Mario (a 2D platformer that reinvigorated the franchise after a long hiatus and showed that the 2D games can be just as creative as the 3D games). Really delightful game, Wonder Effects really change levels up! You can even see all the ideas that Wonder has accumulated from the New Super Mario Bros. series, 3D World, people's Super Mario Maker levels, and even Super Mario Run