I think you had Yazuka's theme in the beginning too. this was awesome!

Wicked

Can I get the Serris and Arachnus parts in separate songs? I love those and loop them all the time.

Yeah um...

Put this on guitar hero cause I wanna f#ck it all day! Hellz to the yeah!

Gnarly.

I never made it that far in Metroid Fusion, but this is pretty cool. The Metroid series definitely has a few gems in the soundtrack, and you did a good job arranging this piece from it.

One of those "I'm so glad I found this" songs

Awesome game, awesome music. Definitely well done stuff. You blended the multiple tunes really well, and you successfully hopped back and forth between them without making anything seem out of place (something that sometimes bothers me with some medleys). Anyways, really phenomenal job.