These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Also the "cutscene" the player is treated to before fighting Birth, one of Eboshidori's creations.
Recently, a Fraxian called Omoresu created a boss with a weak spot and attack that both came from a....peculiar place. Naturally, people started to notice.
Game Breaker: Fun mode The "Quicker" ship type. Enough said.
Using splash damage to bypass the barriers on a Sequential Boss and attack the core directly.
Game-Breaking Bug: Several bosses don't work properly in the latest beta versions, despite appearing fine in the editor. These include Eboshidori's Virupaksa II and Sakra-Devanam(This one recently began working again, however). Oneshiningstar's CX-07: Giant Delta 3 has its 3rd delta self-destruct for no apparent reason just before the 4th phase begins. However, if it was not so, you'd be panicking. That thing is spam.
Good Bad Bugs: One bug allows for the creation of a 100% invisible boss, with no hittable parts.
Nightmare Fuel: TekTo and Eboshidori had a battle to create such bosses, the results, Zapan D and Scylla, were very successful.
Nightmare Fuel: Eboshidori's storyline: shortly after Mara's fight with the Phantom 30k, he destroys it while the pilot is calling for backup.SET TO CREEPY MUSIC. It's implied that the P30k and all related ships were created by Sakra-Devanam, and are not human, but still....