- Americans Hate Tingle: The game is rated less highly in the US compared to Japan.
- Critical Dissonance:
- The game received mixed reviews from critics with chief critcism being the combat system. Fan reaction was either more positive towards gameplay or found it good enough to not detract from the other elements.
- The game's Gigolo Mode has caused controversy among professional critics, with a lot of them calling it perverted and some saying the game would kill Suda's career. Fans mostly found it ridiculous at worst, since it's almost too over the top to take seriously; for the record, this may be because Grasshopper was forced to focus on it by the publishers more than they would have liked to.
- Fashion-Victim Villain: David apparently decided that being stark naked save for gold jewelery glued to the bare essentials is a good enough outfit. At least he wears a robe over it. Then he takes it off for the boss fight.note The outfit is so ridiculous that even Mondo calls him out on it.
- Fridge Brilliance: In the mission where you go to the moon, when confronting David, he basically says that killing him at the moment is a grave mistake. Considering David is the final boss, of course it is. There wouldn't be much of a game left if you kill the final boss early.
- Game-Breaker: The Charge Cannon, full stop. You have to do one of the Gigolo missions a second time for it, but when you can obliterate Elite Mooks in one shot, it makes it far more than worth it.
- Goddamn Bats: Any firearm-wielding enemy. Flying turrets in particular, since they can stun Mondo with a single projectile volley.
- Grappler Wires, who can get Mondo in a hold so other Wires can get free hits on him.
- Mis-blamed: Some people thought Gigolo Mode was a tasteless move on Suda's part. Not only was the game was not directed by Suda in the first place, but it turned out it was Kadokawa's urges that forced them to focus on that mode and make it more sexual, losing the opportunity to develop other side content in the process.
- Nightmare Fuel: Alice's One-Winged Angel form in the third chapter, and the transformation into said form.
- The Scrappy: If Steam's user reviews are to be believed, Mika. Mostly due to her impossibly shrill voice and annoying antics.
- Scrappy Mechanic: Gigolo Mode; despite the majority of unlockables revolving around it, there's no gameplay reason to partake in Gigolo Mode beyond the three times needed to unlock all the sub-weapons. The girls will still regularly call to bug you during story missions to come see them, and keeping up on buying said presents sinks a lot of money, money that could've otherwise gone into buying prohibitively expensive upgrade items and endgame Mondo costumes.
- That One Boss: Hamada-Yama. In a game where Just Defenses and Burst Rushes are strongly encouraged over simple blocking, his attacks are nigh-impossible to pull either off with, and if you don't break the habit and just start blocking his attacks normally he'll absolutely wreck you.
- That One Sidequest: Weight Limit, an Elevator Action Sequence where the elevator stops every time there's more than two Wires riding it at any time. Problem is, Wires respawn almost immediately after they're killed, and the enemy types are some of the most aggravating Goddamn Bats in the game.
- The Gentleman's Payment bonus is the bane of anyone looking for an AAA-rank on a mission.
- Visual Effects of Awesome: The cel shading in this game looks GREAT, to say the least.
YMMV / Killer Is Dead