I noticed some neat references in the music department, So I thought I would share them.
I may be wrong about these assumptions but I don't think my ears are playing tricks on me.
The Opening Song has the style of The Red Swampy Area of Brinstar from Super Metroid.
Dawn's Ship Main Theme has the style of Lower Norfair from Super Metroid.
First Area sounds like Mt. Itoi from Mother (That is probably just my ears.)
However also sounds like Lower Norfair again from Super Metroid.
Underwater Area has the piano segment from Red Swampy Area of Brinstar from Super Metroid.
Rainy Area sounds like the final hive from Metroid II.
The Federation Ship I swear sounds like the style from Mega Man.
Second Boss Battle has the Lower Norfair sound.
The Area Before The Metroid's Area of course is basically a remix of Lower Norfair from Super Metroid.
I am sure most of the music from Lower Norfair was done because this is a Space Pirate Game run by Ridley afterall.