Games like Infectious
Games like Infectious include Plague Inc: Evolved, Outlast, The Outlast Trials, The Forest, and Alien: Isolation. We matched them by the tags players give Infectious on Steam (Outbreak Sim, Survival Horror, Simulation, Science, and Stealth): closest matches first, and among equally close ones the better-known games.

Plague Inc: Evolved
Shared: Outbreak Sim · Simulation · Indie

Outlast
Shared: Survival Horror · Atmospheric · Survival

The Outlast Trials
Shared: Survival Horror · Stealth · Survival

The Forest
Shared: Survival Horror · Survival · Simulation

Alien: Isolation
Shared: Survival Horror · Stealth · Atmospheric

Amnesia: The Bunker
Shared: Survival Horror · Stealth · Atmospheric

Dead by Daylight
Shared: Survival Horror · Stealth · Survival

Five Nights at Freddy's
Shared: Survival Horror · Simulation · Indie

Universe Sandbox
Shared: Simulation · Science · Realistic

This War of Mine
Shared: Simulation · Atmospheric · Survival

OUTBRK
Shared: Simulation · Realistic · Science

City Car Driving
Shared: Simulation · Survival Horror · Realistic

Thief Simulator 2
Shared: Simulation · Stealth · Atmospheric

Sons Of The Forest
Shared: Survival Horror · Survival · Atmospheric

Barotrauma
Shared: Survival Horror · Simulation · Survival

Papers, Please
Shared: Simulation · Indie · Atmospheric

Thief Simulator
Shared: Simulation · Stealth · Action

Cell to Singularity - Evolution Never Ends
Shared: Simulation · Science · Casual

Halloween: The Game
Shared: Survival Horror · Stealth · Survival

METRO 2033 Redux
Shared: Atmospheric · Survival Horror · Stealth

The Coin Game
Shared: Simulation · Arcade · Survival

Granny Remake
Shared: Survival Horror · Stealth · Atmospheric

Isonzo
Shared: Simulation · Atmospheric · Realistic

The Long Dark
Shared: Survival · Atmospheric · Simulation