All of the mainline Metroid games are about self improvement and overcoming your environment in some form or another, but Fusion is the first to directly tie that into its theme in a meaningful way. Stripped bare of all abilities, you play a Samus robbed of agency, as the game literalizes its structural shift of closed off mini-missions into a story of reclaiming autonomy. You're unprotected and bare, unable to take hits as you used to, and enemies reform right before you eyes. Your worst enemy is a version of Samus who has the strength you once did. A relentless Metroid hunter (not like you yourself were in Metroid 2) coming after the final metroid, Samus herself.
Much has been said about this game being far more linear than all the others, and it's true, but I think also slightly overstated. Yes, the maps are both compulsory and come with objective markers, but you stray very far from them into massive hidden areas and entire pathways pretty often. It's less consistently linear and more as if the game starts hyper linear, but becomes more and more like a proper Metroid game as Samus becomes more like herself. The stripped down protagonist, more relentless enemies, and closed off areas leads to the most claustrophobic and dangerous moment to moment gameplay yet. No longer can you comfortably tank all incoming damage, as even normal enemies can kill you pretty quickly if you're not careful, let alone bosses. You're vulnerable to both heat and cold, and the freezing weapon is forced to be tied to an expendable resource instead of your normal weapon. There's nothing quite as satisfying in the other Metroid games as getting the varia suit so the fucking freezing X blobs can't hurt you anymore.
I only really have one big issue with this game. Every Metroid game has overly cryptic hidden secrets, but this feels like the only one where solving those hidden bits are actually necessary to progress sometimes. The sequence after beating Nightmare is the worst at this, sticking you into a maze extending across sections with multiple seeming dead ends and arbitrary progression paths. Speaking of which, Nightmare itself kinda sucks too. It's easy enough to forgive when literally every other boss here more or less surpasses any of the other ones in any Metroid game though.
Much has been said about this game being far more linear than all the others, and it's true, but I think also slightly overstated. Yes, the maps are both compulsory and come with objective markers, but you stray very far from them into massive hidden areas and entire pathways pretty often. It's less consistently linear and more as if the game starts hyper linear, but becomes more and more like a proper Metroid game as Samus becomes more like herself. The stripped down protagonist, more relentless enemies, and closed off areas leads to the most claustrophobic and dangerous moment to moment gameplay yet. No longer can you comfortably tank all incoming damage, as even normal enemies can kill you pretty quickly if you're not careful, let alone bosses. You're vulnerable to both heat and cold, and the freezing weapon is forced to be tied to an expendable resource instead of your normal weapon. There's nothing quite as satisfying in the other Metroid games as getting the varia suit so the fucking freezing X blobs can't hurt you anymore.
I only really have one big issue with this game. Every Metroid game has overly cryptic hidden secrets, but this feels like the only one where solving those hidden bits are actually necessary to progress sometimes. The sequence after beating Nightmare is the worst at this, sticking you into a maze extending across sections with multiple seeming dead ends and arbitrary progression paths. Speaking of which, Nightmare itself kinda sucks too. It's easy enough to forgive when literally every other boss here more or less surpasses any of the other ones in any Metroid game though.