Games like WAR RATS: The Rat em Up
Games like WAR RATS: The Rat em Up include Cuphead, Skul: The Hero Slayer, Super Amazing Wagon Adventure, Kingdom Rush Vengeance - Tower Defense, and Bit Blaster XL. We matched them by the tags players give WAR RATS: The Rat em Up on Steam (Action, Shoot 'Em Up, Difficult, Cartoon, and 2D): closest matches first, and among equally close ones the better-known games.

Cuphead
Shared: Difficult · Cartoon · 2D

Skul: The Hero Slayer
Shared: Action · 2D · Difficult

Super Amazing Wagon Adventure
Shared: Shoot 'Em Up · Side Scroller · Difficult

Kingdom Rush Vengeance - Tower Defense
Shared: Difficult · 2D · Tower Defense

Bit Blaster XL
Shared: Shoot 'Em Up · Difficult · Action

Guns, Gore & Cannoli
Shared: Action · 2D · Shoot 'Em Up

Kingdom Rush - Tower Defense
Shared: 2D · Action · Tower Defense

Kingdom Rush Frontiers - Tower Defense
Shared: Difficult · 2D · Tower Defense

DR LIVESEY ROM AND DEATH EDITION
Shared: Action · Cartoon · Difficult

Star of Providence
Shared: Shoot 'Em Up · Action · Difficult

BALL x PIT
Shared: Action · Shoot 'Em Up · Roguelite

METAL SLUG
Shared: Action · 2D · Shoot 'Em Up

Guns, Gore and Cannoli 2
Shared: Action · 2D · Side Scroller

Broforce
Shared: Action · 2D · Shooter

Kingdom Rush 5: Alliance TD
Shared: 2D · Cartoon · Tower Defense

Huntdown
Shared: Action · Shoot 'Em Up · Shooter

Nova Drift
Shared: Shoot 'Em Up · Action · Shooter

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Difficult · Action

Contra Anniversary Collection
Shared: Action · 2D · Side Scroller

Have a Nice Death
Shared: Action · 2D · Action Roguelike

Alex Jones: NWO Wars
Shared: Action · Shoot 'Em Up · Shooter

Zombotron
Shared: Action · 2D · Shooter

GemCraft - Frostborn Wrath
Shared: Difficult · Action · Tower Defense

METAL SLUG X
Shared: Action · Shoot 'Em Up · 2D