Games like The New Earth
Games like The New Earth include Oxygen Not Included, Dyson Sphere Program, RimWorld, Hardspace: Shipbreaker, and SpaceEngine. We matched them by the tags players give The New Earth on Steam (Singleplayer, Casual, Simulation, 3D Platformer, and Base Building): closest matches first, and among equally close ones the better-known games.

Oxygen Not Included
Shared: Base Building · Singleplayer · Colony Sim

Dyson Sphere Program
Shared: Base Building · Space · Simulation

RimWorld
Shared: Base Building · Singleplayer · Simulation

Hardspace: Shipbreaker
Shared: Simulation · Singleplayer · Space

SpaceEngine
Shared: Casual · Space · Space Sim

Kerbal Space Program
Shared: Simulation · Space · Singleplayer

Space Engineers
Shared: Simulation · Space · Singleplayer

Planetbase
Shared: Base Building · Space · Simulation

Space Haven
Shared: Base Building · Simulation · Space

Gas Station Simulator
Shared: Simulation · Singleplayer · Casual

Mountain
Shared: Simulation · Casual · Singleplayer

Elite Dangerous
Shared: Space · Simulation · Space Sim

X4: Foundations
Shared: Simulation · Space · Space Sim

House Flipper
Shared: Simulation · Singleplayer · Casual

Spacebase DF-9
Shared: Simulation · Base Building · Space

Prison Architect
Shared: Simulation · Base Building · Colony Sim

IXION
Shared: Space · Base Building · Simulation

SPORE™
Shared: Simulation · Casual · Space

Anno 2205™
Shared: Simulation · Singleplayer · Futuristic

Starpoint Gemini 2
Shared: Simulation · Space · Singleplayer

Frostpunk
Shared: Singleplayer · Base Building · Simulation

Plague Inc: Evolved
Shared: Simulation · Singleplayer · Casual

Stellaris
Shared: Space · Simulation · Singleplayer

Universe Sandbox
Shared: Simulation · Space · Space Sim