For a deep dive into how Metroid Fusion uses parasitic design and tension to redefine the series' storytelling, watch this video essay:
Samus is physically "softer," taking significantly more damage from enemies than in previous titles. Metroid Fusion
The most terrifying element is the SA-X , an X Parasite mimicking Samus at her full potential. These scripted stealth sequences, where the player is completely powerless to fight back, transform the game into a "cat-and-mouse" horror experience. For a deep dive into how Metroid Fusion