To put it simply it’s a game where progress is focused squarely on the passive thoughtfulness that’s present in Kirby and the Forgotten Land.
People every now and then try to call it a Metroidvania, which isn’t exactly true since you’re not gaining any permanent abilities that effect how you can traverse the world instead it’s a matter of going down a series of winding paths, noticing all the extra paths along the way which require certain abilities to go down, and then being mindful to bring those abilities with you next time you find yourself around that area. Polm23 To keep it squarely on Kirby, Kirby and the Amazing Mirror is basically the soul of The Great Cave Offensive from Kirby Super Star manifesting as a whole game.