Games like FallNation Lost Stories
Games like FallNation Lost Stories include SULFUR, Counter-Strike 2, Far Cry® 5, The Binding of Isaac: Rebirth, and Deadzone: Rogue. We matched them by the tags players give FallNation Lost Stories on Steam (Action Roguelike, Exploration, Time Management, FPS, and Immersive Sim): closest matches first, and among equally close ones the better-known games.

SULFUR
Shared: Action Roguelike · FPS · Dungeon Crawler

Counter-Strike 2
Shared: FPS · Shooter · Action

Far Cry® 5
Shared: FPS · Exploration · Action-Adventure

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Dungeon Crawler · Difficult

Deadzone: Rogue
Shared: FPS · Roguelike · Action Roguelike

Content Warning
Shared: Exploration · Action Roguelike · Horror

Ziggurat
Shared: Action Roguelike · FPS · Shooter

SUPERHOT: MIND CONTROL DELETE
Shared: Action Roguelike · FPS · Shooter

Metro Exodus
Shared: FPS · Post-apocalyptic · Exploration

Enter the Gungeon
Shared: Action Roguelike · Dungeon Crawler · Difficult

Project Silverfish
Shared: Exploration · FPS · Immersive Sim

S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: FPS · Exploration · Shooter

Lethal Company
Shared: Exploration · First-Person · Horror

Deep Rock Galactic
Shared: FPS · Exploration · Shooter

Twisted Tower
Shared: Exploration · FPS · Shooter

Fallout 4
Shared: Exploration · Shooter · FPS

Gunfire Reborn
Shared: FPS · Action Roguelike · Roguelike

The Exit 8
Shared: Exploration · Puzzle · Immersive Sim

Void Bastards
Shared: Action Roguelike · FPS · Immersive Sim

Post Void
Shared: Action Roguelike · FPS · Difficult

Far Cry® 6
Shared: FPS · Exploration · Shooter

METRO Last Light Redux
Shared: FPS · Shooter · Post-apocalyptic

S.T.A.L.K.E.R.: Shadow of Chornobyl - Enhanced Edition
Shared: Exploration · FPS · Immersive Sim

METRO 2033 Redux
Shared: FPS · Shooter · Post-apocalyptic