Games like Solarix
Games like Solarix include Half-Life 2, Black Mesa, Half-Life: Alyx, METRO Last Light Redux, and METRO 2033 Redux. We matched them by the tags players give Solarix on Steam (Action, Indie, Stealth, Horror, and Sci-fi): closest matches first, and among equally close ones the better-known games.

Half-Life 2
Shared: Action · Sci-fi · FPS

Black Mesa
Shared: Action · FPS · Sci-fi

Half-Life: Alyx
Shared: Horror · Story Rich · FPS

METRO Last Light Redux
Shared: Action · FPS · Horror

METRO 2033 Redux
Shared: Action · Horror · FPS

Metro Exodus
Shared: Action · FPS · Story Rich

BioShock Infinite
Shared: Action · FPS · Story Rich

Trepang2
Shared: Horror · Action · FPS

Ready or Not
Shared: FPS · Horror · Action

BioShock™
Shared: Action · FPS · Story Rich

BioShock™ Remastered
Shared: Horror · Story Rich · Action

BioShock™ 2 Remastered
Shared: Action · FPS · Horror

BioShock® 2
Shared: Action · FPS · Horror

Aliens vs. Predator™
Shared: Action · FPS · Sci-fi

Wolfenstein: The New Order
Shared: Action · FPS · Singleplayer

F.E.A.R.
Shared: Action · Horror · FPS

Prey
Shared: Sci-fi · Horror · Singleplayer

Resident Evil Village
Shared: Horror · Action · Singleplayer

DOOM
Shared: Action · FPS · Shooter

Bright Memory: Infinite
Shared: Action · Indie · FPS

In Sound Mind
Shared: Horror · Action · Story Rich

Halo Infinite
Shared: Action · FPS · Singleplayer

Wolfenstein II: The New Colossus
Shared: Action · FPS · Singleplayer

RoboCop: Rogue City
Shared: Action · FPS · Story Rich