* 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.
* 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.
* 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 both a DamageSpongeBoss and 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]]. (Technically, he's a BonusBoss, but [[spoiler:reaching the Abyss without shooting any white rabbits, zombie Blemineg, or Gamey before his compact with Magnus]] forces you to fight him instead of the final boss, so he still counts.)