When you’ve developed a successful franchise, the natural thing to do with a sequel is to throw everything that made the previous games good out the window and try something completely different.
I’m being facetious, but this is actually something Nintendo has done more than once over the course of several of its classic series’ lifetimes. Sometimes it works indisputably well — few people would consider the reskinned Doki Doki Panic that we Westerners know as Super Mario Bros. 2 to be a “bad” game, for example, despite how different it was from its predecessor.
Sometimes, though, we get something like Donkey Kong 3, and no-one is quite sure what to make of it. And that’s kind of why I really, really like it.