Well...
Don't take this as an overly harsh criticism, but your music needs more "OOMPH!", in my opinion.
I've listened to this track, and a few others on your submissions list. While the music DOES indeed follow the theme and style of Metroid, and is well written, this and a few of your other songs could use some sharper, accented tones.
Honestly, whenever I hear a traditional instrument in your music, it sounds weak and soft. And by weak, I don't mean low volume. It sounds like someone is purposely being light on the instrument (like "talking" as opposed to "announcing"). Talking is good for some instruments in some places, but for other deeper tones, a more forceful announcing sound is more realistic.
I know there's a limit to what you can do with synthetic instruments, but this is MY take on your music.
You do good work! Kudos!