Games like Retroninjacyberassassin
Games like Retroninjacyberassassin include Ghostrunner, Bright Memory, Bright Memory: Infinite, Judgment, and Lost Judgment. We matched them by the tags players give Retroninjacyberassassin on Steam (Hack and Slash, Beat 'em up, 3D Fighter, 2.5D, and First-Person): closest matches first, and among equally close ones the better-known games.

Ghostrunner
Shared: Action · First-Person · Hack and Slash

Bright Memory
Shared: Hack and Slash · First-Person · Action

Bright Memory: Infinite
Shared: Action · Hack and Slash · First-Person

Judgment
Shared: Beat 'em up · Action · 3D Fighter

Lost Judgment
Shared: Beat 'em up · Action · 3D Fighter

God of War
Shared: Action · Hack and Slash · Singleplayer

BioShock Infinite
Shared: Action · First-Person · Singleplayer

Deus Ex: Mankind Divided
Shared: Action · Stealth · Sci-fi

Half-Life 2
Shared: Action · Sci-fi · First-Person

STAR WARS™ - The Force Unleashed™ Ultimate Sith Edition
Shared: Hack and Slash · Action · Sci-fi

ICEY
Shared: Hack and Slash · Action · Adventure

Black Mesa
Shared: Action · First-Person · Sci-fi

Castle Crashers®
Shared: Beat 'em up · Hack and Slash · Action

Deus Ex: Human Revolution - Director’s Cut
Shared: Action · Stealth · Sci-fi

METAL GEAR RISING: REVENGEANCE
Shared: Hack and Slash · Action · Singleplayer

Cyberpunk 2077
Shared: First-Person · Sci-fi · Cyberpunk

Dishonored
Shared: First-Person · Action · Stealth

Far Cry 3 - Blood Dragon
Shared: Action · 1980s · Sci-fi

Ryse: Son of Rome
Shared: Hack and Slash · Action · Linear

Stellar Blade™
Shared: Hack and Slash · Action · Singleplayer

RoboCop: Rogue City
Shared: Action · First-Person · Sci-fi

RWBY: Grimm Eclipse
Shared: Hack and Slash · Beat 'em up · Action

Ghostrunner 2
Shared: Hack and Slash · Action · First-Person

Bayonetta
Shared: Hack and Slash · Action · Beat 'em up