Games like Planetary Defense
Games like Planetary Defense include Streets of Rage 4, Nova Drift, METAL SLUG, Project Wingman, and ACE COMBAT™ 7: SKIES UNKNOWN. We matched them by the tags players give Planetary Defense on Steam (Action, Arcade, Shooter, Space Sim, and Simulation): closest matches first, and among equally close ones the better-known games.
Streets of Rage 4
Shared: Action · Arcade · Beat 'em up
Nova Drift
Shared: Arcade · Shoot 'Em Up · Shooter
METAL SLUG
Shared: Action · Arcade · Shoot 'Em Up
Project Wingman
Shared: Action · Arcade · Flight
ACE COMBAT™ 7: SKIES UNKNOWN
Shared: Arcade · Shooter · Flight
BALL x PIT
Shared: Action · Arcade · Shoot 'Em Up
Huntdown
Shared: Action · Shooter · Side Scroller
METAL SLUG 3
Shared: Arcade · Action · Shooter
Alex Jones: NWO Wars
Shared: Action · Arcade · Shooter
Bit Blaster XL
Shared: Shooter · Arcade · Shoot 'Em Up
Sky Force Reloaded
Shared: Arcade · Shoot 'Em Up · Action
LUFTRAUSERS
Shared: Arcade · Action · Shoot 'Em Up
War Thunder
Shared: Action · Simulation · Flight
KovaaK's
Shared: Action · Shooter · Simulation
SNKRX
Shared: Arcade · Shoot 'Em Up · Shooter
Guns, Gore & Cannoli
Shared: Action · Side Scroller · Shoot 'Em Up
METAL SLUG X
Shared: Action · Arcade · Shoot 'Em Up
Planes, Bullets and Vodka
Shared: Action · Arcade · Shoot 'Em Up
Broforce
Shared: Action · Shooter · 2D
Commando Collection
Shared: Action · Shooter · Arcade
Arma 3
Shared: Action · Shooter · Simulation
Aimlabs
Shared: Shooter · Action · Simulation
Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: Beat 'em up · Arcade · Side Scroller
House of the Dying Sun
Shared: Action · Simulation · Space Sim