Many of the most popular video games 8bits, do not use the same beat counter for 4 minuets
You also had a major conflict of tracks at 1.20 because of the deeper sounds that could have stood by themselves, but the over ruling techno 8bit track you had played actually managed to ruin the sound :(

Take a listen to this YouTube song.... g-jK3NSka1Y.... You don't need to fill an entire area with a sound to get an image of a theme across... You only need what is needed, past that you can add the little bit of a remix or a backdrop sound here and there
Also! You don't have to differ greatly from a song to make it completely your own
Even dropping to a C minor or climbing to an A minor is and will always make things sound different

i would love to hear what you... With no backgrounds... Would make yourself..... No remix... No easel... No CC... No fingerprint...

A beautiful yet creepy-style rendition to better times~
I love how it transitions into Magmoor Caverns.
But here's a little bit of Metroid Trivia
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Magmoor Cavern's theme is actually an homage to Super Metroid's version of Norfair.
Isn't it nice how things work out so nicely in later games?