While still a great game, many criticize Metroid Fusion for being way more straightforward in terms of level progression than other entries in the series. But, perhaps there is a good reason for this. The X parasites, rather than simply kill her, seem to be using Samus for further their own goals by having her open more and more areas of the space station. Is Samus unaware of this trickery, or does she realize that she has no other options, but to go along with it for now? Because of this, a sense of fear is instilled in Samus, and beyond her the player. But is it a fear of horror or more of a fear of the unknown? And how scary a thing curiosity, like wanting to know what happens next, can be. This video by Rated S Games dives into more detail on the subject.