Games like Fortitude invasion
Games like Fortitude invasion include Rogue Legacy 2, Vampire Survivors, Skul: The Hero Slayer, Broforce, and 12 is Better Than 6. We matched them by the tags players give Fortitude invasion on Steam (Action, Arcade, Shooter, Side Scroller, and Roguelite): closest matches first, and among equally close ones the better-known games.
Rogue Legacy 2
Shared: Arcade · Action · Roguelite
Vampire Survivors
Shared: Roguelite · 2D · Arcade
Skul: The Hero Slayer
Shared: Action · 2D · Roguelite
Broforce
Shared: Action · 2D · Shooter
12 is Better Than 6
Shared: Action · Shooter · Hand-drawn
Streets of Rage 4
Shared: Action · Arcade · 2D
BALL x PIT
Shared: Action · Arcade · Roguelite
My Friend Pedro
Shared: Action · Shooter · Indie
METAL SLUG
Shared: Action · Arcade · Side Scroller
METAL SLUG 3
Shared: Arcade · Action · Side Scroller
Megabonk
Shared: Roguelite · Action · Indie
Hades
Shared: Roguelite · Action · Indie
Rogue Legacy
Shared: Action · 2D · Indie
PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Survival
Huntdown
Shared: Action · Shooter · Side Scroller
Alex Jones: NWO Wars
Shared: Action · Arcade · Shooter
Exit the Gungeon
Shared: Arcade · Action · 2D
METRO Last Light Redux
Shared: Action · Atmospheric · Shooter
METRO 2033 Redux
Shared: Action · Atmospheric · Shooter
Dead Space™ 2
Shared: Shooter · Action · Survival
Guns, Gore & Cannoli
Shared: Action · Side Scroller · 2D
BioShock Infinite
Shared: Action · Shooter · Atmospheric
Deadlight
Shared: Action · Side Scroller · Indie
Nova Drift
Shared: Arcade · Roguelite · Shooter