Games like Attack of the Earthlings
Games like Attack of the Earthlings include XCOM: Enemy Unknown, XCOM®: Chimera Squad, STAR WARS Zero Company™, Warhammer 40,000: Mechanicus, and Into the Breach. We matched them by the tags players give Attack of the Earthlings on Steam (Strategy, Indie, Turn-Based Strategy, Dark Humor, and Comedy): closest matches first, and among equally close ones the better-known games.

XCOM: Enemy Unknown
Shared: Strategy · Turn-Based Strategy · Sci-fi

XCOM®: Chimera Squad
Shared: Strategy · Turn-Based Strategy · Sci-fi

STAR WARS Zero Company™
Shared: Turn-Based Strategy · Strategy · Sci-fi

Warhammer 40,000: Mechanicus
Shared: Strategy · Sci-fi · Turn-Based Strategy

Into the Breach
Shared: Strategy · Turn-Based Strategy · Indie

BattleTech
Shared: Strategy · Turn-Based Strategy · Sci-fi

Sid Meier's Civilization®: Beyond Earth™
Shared: Strategy · Turn-Based Strategy · Sci-fi

Sid Meier’s Civilization® VI
Shared: Strategy · Turn-Based Strategy · Singleplayer

The Last Spell
Shared: Strategy · Turn-Based Strategy · Singleplayer

ENDLESS Legend™
Shared: Strategy · Turn-Based Strategy · Indie

Party Hard
Shared: Strategy · Indie · Dark Humor

XCOM 2
Shared: Strategy · Sci-fi · Singleplayer

FTL: Faster Than Light
Shared: Strategy · Indie · Sci-fi

ENDLESS Space™ - Definitive Edition
Shared: Strategy · Turn-Based Strategy · Sci-fi

This Is the Police 2
Shared: Strategy · Indie · Singleplayer

Gears Tactics
Shared: Strategy · Gore · Singleplayer

Library Of Ruina
Shared: Strategy · Indie · Singleplayer

X-COM: UFO Defense
Shared: Strategy · Turn-Based Strategy · Sci-fi

ENDLESS Space™ 2
Shared: Strategy · Turn-Based Strategy · Sci-fi

Space Hulk (Classic)
Shared: Strategy · Turn-Based Strategy · Indie

Sid Meier's Civilization® V
Shared: Strategy · Turn-Based Strategy · Singleplayer

The Banner Saga 3
Shared: Strategy · Indie · Turn-Based Strategy

Xenonauts
Shared: Turn-Based Strategy · Strategy · Singleplayer

Mewgenics
Shared: Dark Humor · Turn-Based Strategy · Turn-Based Tactics