Games like Foolish Earthlings!
Games like Foolish Earthlings! include Vampire Survivors, Broforce, Teenage Mutant Ninja Turtles: Shredder's Revenge, Kung Fury: Street Rage - Ultimate Edition, and Streets of Rage 4. We matched them by the tags players give Foolish Earthlings! on Steam (Action, 1980s, Aliens, Side Scroller, and Old School): closest matches first, and among equally close ones the better-known games.
Vampire Survivors
Shared: Bullet Hell · 2D · Action
Broforce
Shared: Action · 2D · Side Scroller
Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: Side Scroller · Action · Arcade
Kung Fury: Street Rage - Ultimate Edition
Shared: Action · Arcade · 1980s
Streets of Rage 4
Shared: Action · Arcade · 2D
Skul: The Hero Slayer
Shared: Action · Indie · 2D
Bit Blaster XL
Shared: Bullet Hell · Action · Arcade
BALL x PIT
Shared: Action · Arcade · Bullet Hell
Exit the Gungeon
Shared: Action · Arcade · Bullet Hell
METAL SLUG
Shared: Action · Side Scroller · Arcade
LUFTRAUSERS
Shared: Action · Arcade · Bullet Hell
Jets'n'Guns Gold
Shared: Action · Side Scroller · Bullet Hell
Hotline Miami
Shared: Action · 1980s · Indie
Starship Troopers: Extermination
Shared: Action · Aliens · Sci-fi
UFO 50
Shared: Action · Arcade · Indie
Huntdown
Shared: Action · Side Scroller · 2D
Alien Hominid HD
Shared: Action · Arcade · Side Scroller
Windowkill
Shared: Action · Arcade · Bullet Hell
ICEY
Shared: Action · Side Scroller · 2D
Timberman
Shared: Action · Indie · Arcade
Rogue Legacy
Shared: Action · Indie · 2D
Shovel Knight: Treasure Trove
Shared: Action · 2D · Indie
METAL SLUG 3
Shared: Action · Arcade · Side Scroller
METAL SLUG X
Shared: Action · Arcade · 2D