* AlternateCharacterInterpretation: One for Kamoebas, [[spoiler:was it dragging Ganimes into the volcano at the end as an attempt to finally kill its enemy, or was it like Obata, aware it was under the mind control of an alien and tried to kill itself alongside Ganimes to make sure it doesn’t escape?]]
* SugarWiki/AwesomeMusic: Even in a movie like this, Akira Ifukube still puts his best effort into the score. The [[https://m.youtube.com/watch?v=BGsazeMmZrY opening theme]] itself is one of the liveliest tracks he’s ever composed, with a great use of synthesizers to highlight the terror of the monsters.
* CompleteMonster: The titular [[BlobMonster Space Amoeba]], or "Yog", is an alien creature attempting to conquer Earth. Crash landing near Selgio island, Yog takes control of the sea monster Gezora, killing resort workers before it attacks in the island village. After Gezora is burned to death, Yog mutates a rubble crab into [[GiantEnemyCrab Ganimes]], and begins attacking surviving islanders. When Ganimes dies, Yog takes over the body of Makoto Obata, gloating to him that it has taken over his mind, and begins exterminating the local bat population so the bats can't interfere with its control over its monsters. Making another Ganimes and another kaiju Komebas, Yog begins attacking islanders until they are saved by some surviving bats. Yog then tries to burn the rest of the bats before using Komebas and Ganimes to kill the people on the island for learning of its weakness.
* EnsembleDarkHorse: All 3 Kaiju [[note]] Gezora, Ganimes and Kamoebas [[/note]] are fairly liked amongst the fans for their semi-realistic take on real life sea creatures. Kamoebas in particular would make a brief cameo in [[Film/GodzillaTokyoSOS a later Godzilla movie]], and then all 3 are among the Kaiju that ravaged the world during [[Anime/GodzillaPlanetOfTheMonsters the anime trilogy prequel novel, Monster Apocalypse]].
* SoOkayItsAverage: The general consensus amongst kaiju fans. It’s not a bad movie by any means, but it’s nothing too special either.
* SpecialEffectsFailure: Though the suits for Ganimes and Kamoebas [[SugarWiki/VisualEffectsOfAwesome are actually well designed and very detailed]], Gezora, unfortunately, looks the least convincing. Not only is it obvious that it’s a man in a suit by the lack of movements in its other tentacles, but the eyes are supposed to light up, yet in some shots it’s clear the mechanism used to light up said eyes malfunctioned.