SO THAT'S WHERE HE'S BEEN
Donkey Kong Bananza - https://youtu.be/ZBA4AySbwlI
That song is so fantastic.
This game has plenty of references to Donkey Kong Country (the first three games, not the Retro Studios titles) and it's clear that they were canon. However, even in the Retro Studios titles (Returns and Tropical Freeze), K. Rool never shows up. There were no kremlings at all! And so, at long last, we get an explanation for where he's been all these years. He clearly came after Exploritone, but he's also definitely been down here for a long while.
I believe that while K. Rool was sealed away, so were all of his Kremlings. The foes we fought before were gold skeletons… in the shape of Kremlings. I hadn't registered it, because I thought it was just things that Void had made, but no. He just exploited what was already there, like with everything else. It's a good thing the Root sealed him away, because he was years ahead of everyone else!
(Also, I didn't comment on it, but the theme for Phase 2, the Kredits and while we're riding the Root's drill, is a remix of "Pirate Panic," the theme for K. Rool's boss fight in DKC 1 and the first level of DKC 2.)
As for the gameplay and other non-plot things, yes, that was a worthy finale. I really liked how it built on all the things we'd learned along the way, and it was cool how the various projectiles that are so painful to deal with for DKC 2's final boss got remade in 3D. They even come in the same order. It was also funny that I played this right after Super Mario Odyssey, considering where we end up. It was months ago now, but it was still the immediate prior game.
As for where it goes from here: just like with Odyssey, I want to do everything! I don't like setting a goal of 100% on anything (and honestly want to end my Breath of the Wild playthrough pretty soon) but I think "every banana" is a reasonable mark of completion for this game. Nothing's been insanely hard so far, except maybe that one knockdown. Even then, it was only about twenty minutes. And when that's done, I'll check out the DLC, and then it's on to the next game.