Games like Retro Invasion
Games like Retro Invasion include Half-Life 2, Black Mesa, Bright Memory: Infinite, Half-Life, and BioShock Infinite. We matched them by the tags players give Retro Invasion on Steam (Action, Singleplayer, Retro, Shooter, and Sci-fi): closest matches first, and among equally close ones the better-known games.

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

Black Mesa
Shared: Action · Singleplayer · Sci-fi

Bright Memory: Infinite
Shared: Action · Singleplayer · Shooter

Half-Life
Shared: Singleplayer · Sci-fi · Action

BioShock Infinite
Shared: Action · Shooter · Singleplayer

STAR WARS™ Battlefront™ II
Shared: Singleplayer · Shooter · Action

Titanfall® 2
Shared: Singleplayer · Shooter · Action

Halo Infinite
Shared: Singleplayer · Action · Shooter

Half-Life: Blue Shift
Shared: Action · Singleplayer · Sci-fi

Half-Life: Opposing Force
Shared: Action · Singleplayer · Sci-fi

Zombotron
Shared: Action · Singleplayer · Shooter

My Friend Pedro
Shared: Action · Shooter · Indie

KovaaK's
Shared: Action · Shooter · Singleplayer

STAR WARS™ Battlefront II (Classic, 2005)
Shared: Action · Shooter · Sci-fi

Call of Duty®
Shared: Singleplayer · Action · Shooter

Crysis Remastered
Shared: Action · Shooter · Singleplayer

Intrusion 2
Shared: Action · Shooter · Singleplayer

Warhammer 40,000: Space Marine 2
Shared: Action · Singleplayer · Sci-fi

Hotline Miami
Shared: Action · Indie · Retro

SUPERHOT
Shared: Action · Singleplayer · Shooter

Call of Duty®: Black Ops III
Shared: Action · Shooter · Singleplayer

DOOM
Shared: Action · Shooter · Singleplayer

EARTH DEFENSE FORCE 6
Shared: Action · Shooter · Sci-fi

Neon White
Shared: Action · 3D Platformer · Shooter