Games like Emu War!
Games like Emu War! include People Playground, POSTAL 2, Guts and Glory, My Friend Pedro, and Postal III. We matched them by the tags players give Emu War! on Steam (Action, Casual, Indie, Gore, and Violent): closest matches first, and among equally close ones the better-known games.

People Playground
Shared: Gore · Sandbox · Violent

POSTAL 2
Shared: Violent · Sandbox · Funny

Guts and Glory
Shared: Action · Gore · Casual

My Friend Pedro
Shared: Action · Indie · Gore

Postal III
Shared: Action · Gore · Violent

171
Shared: Action · Indie · Gore

Just Cause 4 Reloaded
Shared: Action · Sandbox · Third-Person Shooter

Goat Simulator
Shared: Casual · Funny · Sandbox

Garry's Mod
Shared: Sandbox · Casual · Funny

Grand Theft Auto V Legacy
Shared: Action · Third Person · Third-Person Shooter

STANDBOX
Shared: Action · Gore · Violent

Happy Room
Shared: Action · Gore · Violent

HITMAN World of Assassination
Shared: Action · Sandbox · Violent

GoreBox
Shared: Gore · Violent · Sandbox

Hotline Miami
Shared: Action · Indie · Violent

Happy Wheels
Shared: Gore · Indie · Sandbox

Just Cause™ 3
Shared: Action · Third-Person Shooter · Sandbox

Just Cause 2
Shared: Action · Sandbox · Third Person

Blood and Bacon
Shared: Gore · Action · Funny

Sword With Sauce
Shared: Action · Gore · Violent

Ultimate Epic Battle Simulator
Shared: Action · Sandbox · Violent

Grand Theft Auto IV: The Complete Edition
Shared: Action · Third Person · Third-Person Shooter

Saints Row: The Third
Shared: Action · Third-Person Shooter · Sandbox

GORN
Shared: Action · Gore · Violent