Super Mario Bros. Underwater Theme analysis

I was playing the "Underwater Theme" from Super Mario Bros., and in noticing how "pretty" the chromaticism sounds, I decided to do a harmonic analysis.

Here it here: https://www.youtube.com/watch?v=zc28zcBIX7U

Read the analysis below:


Conclusion? Eh, just use of secondary dominants and passing augmented chords.

For sake of argument, I'll consider a major chord built on scale degree 7 a "secondary dominant" since it's usually interpreted as V/iii, though it's not exactly tonicizing iii here.The ostinato G and voice leading in general is pretty smooth (Note: I also put all nonharmonic tones in parentheses, including passing tones, neighboring tones and ostinato).

Gotta' love them cute Koji Kondo harmonies.