Reminiscent of the barren, lonely and often spooky isolation an desolation of both the locations and music of the Metroid Prime games. It gave me chills... Heh, a pun on the name of the song... >_> But really, this is incredible and I love the slow, unsettling mysteriousness of it. I'm not sure if you did this in a certain key, but if you did, it can't get more perfect than this. Can't spot keys and all that, so sorry if I'm being a bit ignorant - I appreciate creativity in music (and this piece brings it), but I can only really "visualize" my own melodies and such, as I lack the abilities to read/write music, and I won't even go into my keyboard/guitar "skill level".
Anyway, enough of that tangent. More comments! At 1:26-27, that 8-bit-ish sytnth kicks in. I'm not sure if you're familiar with the Game Boy Advance series "Boktai" (if you're one of us lucky few to have played even just one of the games, you're a blessed soul), but the second half of the song kinda instantly make me think of the way the music in said games plays out, what with all the other instruments in the background.
Very well done. I've had this looping for about 20 minutes now, so clearly this is a winner, haha. Rating 5/5 And giving 5/5 stars.