Konami went full pop album with this one. Twin Memories opens like a 90s J-pop single that just happens to be a stage theme, complete with vocals riding over that bright SPC700 sound. Fantasian shifts gears into something dreamy and floating, like the game forgot it was a shoot-em-up for a minute.
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The Madoka message tracks thread through the whole thing as these gentle spoken interludes, giving the soundtrack an almost radio-show structure. Eternal Planets closes it out with real weight, a proper ending theme that earns its name.
The karaoke versions at the end are a nice touch. If you ever wanted proof cute-em-ups had the best music departments, start here.