Games like Spaceslingers
Games like Spaceslingers include Kerbal Space Program, Universe Sandbox, Kerbal Space Program 2, Hardspace: Shipbreaker, and Noita. We matched them by the tags players give Spaceslingers on Steam (Competitive, Time Manipulation, Space, Physics, and Difficult): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Space · Physics · Simulation

Universe Sandbox
Shared: Space · Physics · Simulation

Kerbal Space Program 2
Shared: Space · Physics · Difficult

Hardspace: Shipbreaker
Shared: Space · Physics · Simulation

Noita
Shared: Physics · Difficult · 2D

FTL: Faster Than Light
Shared: Space · Difficult · Indie

V: Rings of Saturn
Shared: Space · Physics · Space Sim

Elite Dangerous
Shared: Space · Space Sim · Simulation

Ostranauts
Shared: Flight · Difficult · Space

Exo One
Shared: Space · Flight · Physics

Space Engineers
Shared: Space · Physics · Simulation

Solar 2
Shared: Space · Physics · Simulation

EVE Online
Shared: Space Sim · Space · Difficult

Defy Gravity Extended
Shared: Space · Difficult · 2D

Reentry - A Space Flight Simulator
Shared: Space · Flight · Space Sim

Orbt XL
Shared: Difficult · Arcade · 2D

EVERSPACE™
Shared: Space · Space Sim · Flight

SpaceEngine
Shared: Space · Space Sim · Flight

Spaceflight Simulator
Shared: Space · Space Sim · Simulation

Superflight
Shared: Flight · Physics · Indie

STAR WARS™: Squadrons
Shared: Space · Flight · Simulation

Cosmoteer: Starship Architect & Commander
Shared: Space · Space Sim · 2D

X4: Foundations
Shared: Space · Space Sim · Simulation

Trailmakers
Shared: Space · Flight · Action