- Awesome Music: Final Fight. 4 straight minutes of orchestral epicness.
- Breather Level: Octarina's dance levels in Calypso Beach, and the Cymbi-Cart levels.
- Fridge Brilliance: There are playable characters who use Percussion instruments and String Insrtuments, but why no Wind instruments? Because you're already playing as him most of the time.
- In the final boss battle, Tempo jumps off a cliff into a massive crater filled with lava, and is saved by a bird before he dies. This is either What an Idiot! or Fridge Brilliance depending on your view. He does jump off to what would be his apparent doom, but he has to jump or else he dies. That implies that despite his reaction, he had planned to land on the bird all along.
- Game-Breaker: The ability to go back and replay levels, just to gain extra hearts. Not a major one, but it can be exploited to the player's advantage, particularly if you're really struggling in the later levels. Granted, it will only allow you to collect up to 8 hearts, but that's enough to see you through some of the more difficult levels.
- Narm: Its tough to catch, but in the sequence before Discordred's boss fight, Tempo goes up to the side of the ship monster, and the face on the back looks at him. The face on the rear end of the ship is reflected, so while one eye on one end of the face looks at tempo, the other one looks the opposite way on the edge of the screen, effectively making an angry derp face.
- Squick: Otamama's attacks. It forces out its eggs (sometimes its fully formed babies) in hopes of taking you down.
- And then you proceed to smack its babies back at its rear...
- That One Attack: Every boss has at least one attack that causes you to lose instantly if you mess it up. Out of them though, Buzzooka's is particularly brutal. (It's a sequence of 5 rapid button presses that have to be done with near-perfect timing, and what's worse is that it's the last hit of the fight)
- That One Boss: Buzzooka is this due to it being hard to hit the enemies he fires out,the canyon section involving the use of the D-pad and being a long battle. The fact that it was the boss in the Demo doesn't help nor the fact that the Final Boss is nasty in this regard as well.
- That One Level: Clockwork Trial. The music's speed shifts erratically, and it occurs during action-intensive parts, meaning you'll have to adjust while already playing to the beat. Doing it on fast makes it ridiculous.
- Underused Game Mechanic: Lyra and Tyko have their own gameplay styles different from Tempo's (Lyra uses a bow and arrow, while Tyko has his pet monkey Cymbi, allowing him to attack two enemies at different heights at the same time). Sadly they're used in only a third of the levels they appear in.
YMMV / HarmoKnight