Trivia / Enter the Gungeon

• Development Gag: The description for the Bracket Key active item states that it is "A remnant from when the Gungeon was being built", and that "Gungeon architects would use these artifacts to quickly make their way through Gundead infested chambers." This refers to how, in creating the game, the right bracket key was used for automatically clearing all enemies in a room to grease the wheels of game development.
• Dummied Out:
  • Several bosses have been cut from the final game, but only one of them is relatively functional: "The Bunker". Since its attacks work properly, and it has both an Ammonomicon entry and a piece of related dialogue from the Drunkard, it seems to have been cut rather late in development.
    • Another interesting cut boss is simply named "Shopkeep". While it's in a very unfinished state (it uses placeholder sprites from High Priest and only has one simple attack), its name also happens to be the internal name for Bello. This implies that Bello was originally planned to be killable once the player ticked him off, rather than being invincible while firing his shotgun.
  • There are loads of unused floors, including a jungle, an office, a desert, some sort of futuristic area, and even a Womb Level.
  • Many weapons and items have been cut from the game. While some returned with full functionality in post-launch updates, others have been completely scrapped.
• Follow the Leader: Bears a few similarities to The Binding of Isaac, but has its own identity, putting much more emphasis on Bullet Hell patterns and resource management.
• Urban Legend of Zelda: Despite rumors, it's not possible to kill a Fuselier in one shot with water-based guns (i.e. Mega Douser or The Siren).
• What Could Have Been:
  • The game's first trailer shows off some sort of bishop Bullet Kin, though this enemy is nowhere to be seen in the final game. Datamining reveals that it's a Dummied Out boss in an extremely unfinished state, as it only has one generic attack that is shared with several other scrapped bosses.
  • Two more playable characters, Ninja and Cosmonaut, were planned. Though both characters were cut, a reference to Cosmonaut was kept in the flavour text for the Makarov gun. Advanced Gungeons and Draguns introduces even more cut characters; a blue-haired woman nicknamed Lamey, a gunslinger, and a strange "Eevee" character who re-uses sprites from the final game's characters. While the Gunslinger was later added into the "A Farewell to Arms" update, Eevee ended up being replaced by The Paradox and Lamey became the main character of the House of the Gundead arcade game, bearing the title of Detective.
  • The Resourceful Rat was planned to be a boss at launch, but the pre-Advanced Gungeons and Draguns version of his fight is a simplistic Mirror Boss battle, with no Bullet Hell gimmicks and a dodge roll that he loved to spam. He was scrapped and later retooled into a much more complex boss, since the developers did not think that his old fight was fun in any way.
  • A "Super Boss Rush" mode, which would have contained every boss in the game (the normal Boss Rush mode only has the non-secret bosses), was a planned feature since the game's launch, but ended up being inexplicably scrapped. Only a few remnants of this mode remain in the game's code, namely the level generation data that would have been used.
  • A paid expansion for the game was originally in the works, and would have been released sometime after Advanced Gungeons and Draguns. It has since been canceled due to Dodge Roll being burnt out and wanting to move on with a new project, though the free content update A Farewell to Arms took its place.
  • The Upper Case R exists solely as a synergy with Lower Case r (the one that transforms it into a rocket launcher), but it was likely planned as a full-fledged weapon of its own, as it has a cut Ammonomicon entry.

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