!Tropes
* AscendedFanon: There are some known score runs of the game where a person will "DoublePlay" by controlling both ships at once (famously seen [[https://www.youtube.com/watch?v=Lo7pbKr3Q1E here]] by the player known as "VTF-INO"). The PC version has a built-in feature allowing players to play single-player with both ships at the same time using one controller.
* BadExportForYou: The Platform/NintendoGameCube version of ''Ikaruga'' is the only one that does not have the introduction text for each chapter.
* UrbanLegendOfZelda: Contrary to popular belief, the BossWarningSiren[[note]]'''WARNING''': The big enemy is approaching at full throttle. According to the data, it is identified as "Butsutekkai". '''NO REFUGE'''[[/note]] never changes. "Butsutekkai" is referring to something else and is not the name of the chapter boss. Eboshidori, the Chapter 1 boss, gets misnamed frequently.
* WorkingTitle: "Project [=RS2=]", [[spoiler:which was the first hint that ''Ikaruga'' and ''VideoGame/RadiantSilvergun'' are, in fact, part of the same {{Continuity}}]].

!Miscellaneous Trivia
* ''Ikaruga'' is the first Creator/{{Treasure}} video game to have an official "[[https://www.youtube.com/watch?v=z9eskjwBmp4 Superplay]]" video produced for it.
* The primary game mechanics of ''Ikaruga'' hail from Treasure's earlier games: the chaining system is a modified version of the one used in ''VideoGame/RadiantSilvergun'', while its ReversePolarity mechanic was first utilized in PlatformGame ''VideoGame/SilhouetteMirage''.
* The in-house development team consisted of five people:
** Hiroshi Iuchi -- lead game designer, background designer, and music composer; is also the director of ''Radiant Silvergun''
** Atsutomo Nakagawa -- main programmer
** Yasushi Suzuki -- illustrator and character designer; is also the lead artist of ''VideoGame/SinAndPunishment''
** Satoshi Murata -- sound effects creator and edited the game's background music data
** Masato Maegawa -- executive producer; also Treasure's founder and Chief Executive Officer
** Further support was provided by employees of G.rev, the developer of ''VideoGame/BorderDown'' and ''VideoGame/SenkoNoRonde''
* As a result of the avian ThemeNaming, the etymology of the names of all ships in the game are:
** Ikaruga → Japanese Grosbeak
** Ginkei → Lady Amherst's Pheasant
** [[http://ryuzie.sakura.ne.jp/ikaruga/text/basic/toratsugumi.jpg Toratsugumi]] → White's Thrush
** [[http://ryuzie.sakura.ne.jp/ikaruga/text/basic/utatsugumi.jpg Utatsugumi]] → Song Thrush
** [[http://ryuzie.sakura.ne.jp/ikaruga/text/basic/renjaku.jpg Renjaku]] → Japanese Waxwing
** [[http://ryuzie.sakura.ne.jp/ikaruga/text/basic/torafuzuku.jpg Torafuzuku]] → Long-Eared Owl
** [[http://ryuzie.sakura.ne.jp/ikaruga/text/basic/ajisashi.jpg Ajisashi]] → Common Tern
** [[http://ryuzie.sakura.ne.jp/ikaruga/text/basic/isuka.jpg Ikusa]] -> Common Crossbill
** [[http://ryuzie.sakura.ne.jp/ikaruga/text/basic/misosazai.jpg Misosazai]] → Winter Wren
** [[http://ryuzie.sakura.ne.jp/ikaruga/text/basic/toki.jpg Toki]] → Crested Ibis
** Shigi[[labelnote:*]]Chapter 3 mid-boss[[/labelnote]] → Sandpiper
** Chougenbou[[labelnote:*]]The large FakeUltimateMook ships from Chapter 5[[/labelnote]] → Common Kestrel
** Eboshidori[[labelnote:*]]Chapter 1 Boss[[/labelnote]] → Knysna Turaco
** Bupposo[[labelnote:*]]Chapter 2 Boss[[/labelnote]] → Oriental Dollarbird
** Uzura[[labelnote:*]]Chapter 3 Boss[[/labelnote]] → Japanese Quail
** Misago[[labelnote:*]]Chapter 4 Boss[[/labelnote]] → Osprey
** Tageri[[labelnote:*]]Chapter 5 Boss[[/labelnote]] → Northern Lapwing
* Treasure's official website features cross-platform leaderboards for the Platform/Xbox360, [=NESiCAxLive=], Platform/{{Steam}}, Platform/NintendoSwitch, and Platform/PlayStation4 versions, which can be found [[https://www.treasure-inc.co.jp/ranking.html here]].
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