Honestly, suspense in 'Dead Space' fanfic isn't about jumpscares—that’s the game’s job. The real tension comes from the human collapse happening around the monsters. I always write from the perspective of someone who isn’t an engineer or a soldier, maybe a hydroponics technician or a janitor. They don’t know how to jury-rig a plasma cutter; they’re just trying to understand why the air recyclers smell like burnt meat. The Marker’s influence should be a slow drip, not a flood. Show a character becoming weirdly obsessed with a specific pattern in the station’s plating, or hearing whispers in the constant hum of machinery long before any Necromorph shows up.
You can borrow the game’s structure—the claustrophobic corridors, the failing systems—but the suspense dies if your protagonist is too capable. Limit their resources in a way a game can’t. In a game, you run out of ammo. In a story, you run out of trust. The last person who saw a Necromorph might be babbling, and the crew has to decide: is this a quarantine situation or a mental health crisis? That paranoia, the fear of your own crew turning on you or worse, turning into something, is where the grip comes from. I once wrote a whole chapter where the only 'action' was a character listening to the increasingly unhinged daily logs of a dead crewmate, while the lights in their section slowly dimmed. The monster appeared in the last sentence, and it was almost a relief.
The setting is a character. Ishimura’s sheer, silent bulk creates its own pressure. Don’t just describe the bloodstains; describe the mundane things decaying around them. A coffee cup left spinning in zero-g, the liquid inside long frozen. A child’s drawing taped to a locker, fluttering in a vent breeze. That contrast makes the horror visceral. The suspense snaps when your reader realizes the familiar, human world is being erased, piece by mundane piece, and the protagonist is just another piece waiting to be cleaned up.