It also has a odd and memorable theme that moves around using augmented triads yet isn't octatonic nor based on a whole-tone scale.
There's also a nice moment at the beginning of the credits-- where the theme previously wandered through harmonies quite rapidly, here it gets anchored to a single key with a fairly lush orchestral accompaniment. Then that leads in to a massive pipe organ solo doing the chromatic version of the theme for a final time, then to more fitting electro-orchestral credits music that cycles chromatically through augmented triads. (I think there's a reference to this music in the NES metroid game somewhere, I think it's Ridley's lair)
Anyhow-- the strange orchestral changes and lyrical melodies are the kind of thing that make you stick around for the credits. It's all very simple in a way, but extremely effective, too.
Contrasting that-- I almost laughed in the new Star Wars movie when at the climax the brass just loudly ascends up root position minor triad. It's like being served a steak with a side of a stick of butter.
Edit: I guess I should have written "spoiler" about the loud arpeggiation of a minor triad in the Star Wars movie.