I think it's still Metroid, but it definitely feels more Metroid-lite. It certainly feels like Metroid Gaiden. I still thoroughly enjoy it, but the Prime games knew the Metroid atmosphere much more than this does. Doesn't really get in the way of my enjoyment, though, because this game has everything I like about Metroid games: hidden powerups, fun enemy encounters, nostalgic call-backs, and a somewhat, uh, interesting take on the metroid lore. it's cool.