They're all very good; if you were to submit here you'd need more variation from the source but the quality is good.
For Red Brinstar / Echoes, the melody is too quiet compared to the background. I can barely hear the notes.
Do you plan to make any more Metroid remixes? Outside of Red Brinstar (for some reason), there is a lack of good ones. My suggestions would be Kraid's Lair / Ending from Metroid, Main Deck / Sector 1 from Fusion, Sanctuary / Temple Grounds from Prime 2 and Tallon Overworld / Phendrana Drifts from Prime.