Games like Operation: New Earth
Games like Operation: New Earth include Once Human, Halo Wars: Definitive Edition, XCOM: Enemy Unknown, PUBG: BATTLEGROUNDS, and Where Winds Meet. We matched them by the tags players give Operation: New Earth on Steam (Strategy, Free to Play, Massively Multiplayer, Simulation, and Sci-fi): closest matches first, and among equally close ones the better-known games.

Once Human
Shared: Free to Play · Multiplayer · Survival

Halo Wars: Definitive Edition
Shared: Strategy · Multiplayer · Sci-fi

XCOM: Enemy Unknown
Shared: Strategy · Sci-fi · Tactical

PUBG: BATTLEGROUNDS
Shared: Multiplayer · Survival · Strategy

Where Winds Meet
Shared: Free to Play · Multiplayer · Singleplayer

STAR WARS™ Empire at War - Gold Pack
Shared: Strategy · Sci-fi · Multiplayer

RimWorld
Shared: Strategy · Simulation · Survival

Apex Legends™
Shared: Free to Play · Multiplayer · Sci-fi

Warhammer 40,000: Dawn of War II - Anniversary Edition (Classic)
Shared: Strategy · Sci-fi · Multiplayer

Fishing Planet
Shared: Free to Play · Simulation · Multiplayer

Warhammer 40,000: Dawn of War III
Shared: Strategy · Sci-fi · Multiplayer

Arena Breakout: Infinite
Shared: Free to Play · Multiplayer · Tactical

Delta Force
Shared: Free to Play · Massively Multiplayer · Multiplayer

SMITE®
Shared: Free to Play · Strategy · Multiplayer

Stellaris
Shared: Strategy · Sci-fi · Simulation

Warhammer 40,000: Dawn of War - Anniversary Edition (Classic)
Shared: Strategy · Sci-fi · Multiplayer

Company of Heroes 2
Shared: Strategy · Multiplayer · Tactical

Anno 2070™
Shared: Strategy · Simulation · Futuristic

Plague Inc: Evolved
Shared: Strategy · Simulation · Multiplayer

World of Warships
Shared: Free to Play · Multiplayer · Strategy

Star Trek Online
Shared: Free to Play · Massively Multiplayer · Sci-fi