* AnticlimaxBoss: Spirit grenades will kill the Dark Lord in seconds flat, but he's still easy if you don't have any. If you completely destroy his shield before hitting him (which is laughably easy if you don't let the pieces fall on you), one of his attacks does nothing, another then takes no effort to dodge, and shooting him constantly will kill him before he can kill you with the rest.
* AntiFrustrationFeature: The map, accessible after a fight with Magnus and Gamey [[spoiler:(or at the start, with the Zero Suit Derek picked)]], makes OneHundredPercentCompletion much more accessible.
** The levels are designed in a way that allows leaving them after the boss fights without much backtracking.
* BreatherBoss: Krakomedusae (the giant jellyfish), due to the fact that there's a pipe that dispenses an infinite amount of spirit stones. If you have Spirit of Peace equipped, you can easily restore both your health and mana just by sitting on it. The boss also moves in very predictable patterns, so it's not hard to avoid.
* BreatherLevel: Climbing out of the Abyss, if you went for a GoldenEnding. Justified: [[spoiler: if you defeated the Judge, you deserve it.]]
* ComplacentGamingSyndrome: The Spirit of Peace is ''far'' more useful than the other badges, de facto making your health bar twice as long.
** Defeating the boss in the mines gives you double damage, the ability to shoot underwater, and on your way there you're getting [[RecoilBoost a shotgun-powered]] DoubleJump. By comparison, defeating the boss in the Sunken City gives you the ability to breathe underwater (which at that point is more of an AntiFrustrationFeature) and a health bar extension, while the boss of the tombs gives you nothing but a MacGuffin. They can be defeated in any order, but starting with the first one makes things much easier.
* GoddamnedBats: Literal, as well as in the form of annoying birds.
* GoddamnedBoss: See ThatOneBoss below.
* HellIsThatNoise: The screech the Dead Men make when they see you.
* ThatOneBoss: While much of the game is NintendoHard, most bosses are relatively easy once you've fought them a few times, and the final boss of the good and bad endings is [[AnticlimaxBoss even easier]]. And then there's [[spoiler:the Judge]], who is a GoddamnedBoss to {{Metroidvania}} veterans (because you have to beat all three of his forms and [[spoiler:climb most of the way out of the Abyss]] before you can save) and this to everyone else. His first form is as close to BulletHell as any platformer should dare to get, and getting hit ''at all'' by the other two will usually either knock you into a BottomlessPit or [[OneHitKill kill you outright]].