Contested Sequel: It's ambiguous if New Little King's Story can be classified as a sequel per se, but fans are split on how it stacks up to the original. On one hand, some fans like the new art style and enjoy how the storyline has been expanded considerably from the original game while also adding to the previously established gameplay by adding new features and changing some of the characters from their original iterations to give them more to their personalities and overall character arcs. On the other hand, fans who played the original argue that the change in art style strips the game of its identity, while also turning the story into an utter Cliché Storm that casts away the charm of it and its characters (speaking of, the changes to some of the previously established characters, personality-wise, design-wise or both, caught some heat as well), and the gameplay gets called down for being almost the exact same game, with its few additions being so minute that it hardly matters.
Crowning Moment of Heartwarming: The boy who made the story world based Howser off of his grandpa that had died the year before, saying that he became a knight in Heaven. D'awwwww...
The conclusion of at least a few of the Princess sidequests.
Apricot sits with you on the edge of the Onii King's boss arena and relates that you've given her so many good memories that they outweigh the bad memories of being shut up in the vase. Accordingly, she names the area "Valley of Memories".
Shizuka teleports you and herself to the observation tower, and tells you to watch as UFOs form a heart shape.
Demonic Spiders: The giant frogs (called Yvonnes) appear out of nowhere, bother you during construction, have a hard to predict and hard to avoid One-Hit Kill attack, and can poison your men.
Fridge Brilliance: The rats don't seem to have much reason to act evil. But, if you notice, those same rats have been mimicking the king as he progresses through the adventure, with the Rat King being the leader. That means they've watched him conquer the world, and are now trying to take the kingdom from Corobo.
Fridge Horror: The Giga Carpenters are robots. You have to send people in to make Giga Carpenters. You just forced your citizens to turn themselves into robots just so you can have some of the best carpenters in your army.
King Rat and Blue Rat can drag some of your men into the shadows where they immediately die regardless of life points.
Porting Disaster: The initial version of the Steam release had HORRIBLE performance on rigs that should be able to run it at several hundred frames per second at 4K, random crashes, and encounters that're made harder because of poor coding. Luckily, XSEED gave Durante (the hero to the people who modded the PC versions of Dark Souls 1 and Deadly Premonition from Porting Disasters to Polished Ports) the source code, and he turned it into a Polished Port (which still had some issues with certain encounters at 60 FPS, which is solved with a temporary 30 FPS toggle).
A common agreement amongst players is King Shishkebaboo of the Ripe Kingdom, which is a pinball boss fight where you have to use your troops to hit him across the board. And the areas that make him lose the most calories are pretty damn hard to aim for, not to mention you may have to hit a boulder blocking that part of the board several times to make it accessible in the first place. Did I also mention you have to time your hits just right so your troops don't end up hurt? You deserve a pat on the back if you win this fight on your first try.
King TV Dinnah of the Primetime Kingdom is no cakewalk either if you haven't studied up on your Geography. This much is pretty obvious. But as the fight goes on, he starts to throw out fake hints (by the end of the fight, he trips you up with two false starts before the real hint), which wouldn't be so bad on its own...if you didn't have a strict time limit. How bad? You have less than 20 seconds to guess the last one correctly if you actually wait for the real hint. Worse yet, if you only have one digger left by the end of the fight, there's no way you'll be able to stop the clockwithout guessing and hoping you pick the right place. And there's a lot of choices you can pick incorrectly. Did we also mention that guessing incorrectly or letting time run out gets you punted into a random penalty program that often deals high damage to your troops?
King Long Sauvage is also regarded as one of the most difficult bosses in the game, if not the most difficult. His fight consists of making your way to the top of Mount Sobamanjaro to confront him at its peak. However, there are a ton of deadly obstacles on your way up, some of which can kill your soldiers instantly, there's a few blockades that'll slow you down, and there's a time limit on top of all of this (granted, a very lenient time limit, but it can still take you somewhere in the ballpark of ten to fifteen minutes to get to the top). To make matters worse, you are required to have at least one carpenter in your group when you challenge Sauvage, as you need to build a bridge to get to the peak...which means if your carpenters are all dead by the time you reach that point, you'll have to leave, go back to train more citizens to be carpenters (and rebuild your army) and start the entire fight over from the beginning. And as one final kick to the nads, even if you manage to make it up there with a carpenter, you also have to have enough troops to stack on top of each other so that you can make yourself taller than Sauvage. If you don't - you guessed it - you gotta try the fight again and do that whole Death Course over again until you finally have enough troops make it to the end.
That One Sidequest: Gathering tunes for Princess Kokomo. You have to gather tunes by wandering around your sprawling kingdom and talking to random villagers with notes above their heads. Except villagers only give tunes between 10 P.M. and midnight on the games clock (about a 10 minute window). Plus, the ones that sound like they're humming? You've already gotten them; you want the ones that sound like they're talking. On top of all that, there's no guarantee for any particular location that anyone will be humming, so you can get stuck for multiple nights on the penultimate one even if you know where it's supposed to be. Oh, and at no point does the game tell you any of this.
Ferne's sidequest can be harder than it has any right to be. Five of the seven Kingstones are easy to get if you know where they are, and you can get the last one if you know the trick, but one of them, even if you know what you're supposed to do, may never show up for no known reason.
"Weird Al" Effect Younger players won't recognize the songs from classic Warner Bros. and MGM cartoons which are the origins of Classical music in comedy, which was to prove that Classical music can be used for anything.