Games like Critical Descent
Games like Critical Descent include Kerbal Space Program, Universe Sandbox, Microsoft Flight Simulator (2020) 40th Anniversary Edition, Kerbal Space Program 2, and X-Plane 11. We matched them by the tags players give Critical Descent on Steam (Simulation, Space Sim, Physics, Flight, and Difficult): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Simulation · Physics · Space Sim

Universe Sandbox
Shared: Simulation · Space Sim · Physics

Microsoft Flight Simulator (2020) 40th Anniversary Edition
Shared: Simulation · Flight · Realistic

Kerbal Space Program 2
Shared: Physics · Simulation · Space

X-Plane 11
Shared: Simulation · Flight · Physics

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

Microsoft Flight Simulator X: Steam Edition
Shared: Simulation · Flight · Realistic

BeamNG.drive
Shared: Simulation · Physics · Realistic

Space Engineers
Shared: Simulation · Physics · Space

Uncrashed : FPV Drone Simulator
Shared: Simulation · Flight · Physics

Spaceflight Simulator
Shared: Space Sim · Simulation · Space

VTOL VR
Shared: Simulation · Flight · Physics

Heavenly Bodies
Shared: Physics · Simulation · Difficult

Nuclear Option
Shared: Simulation · Flight · Physics

EVE Online
Shared: Space Sim · Simulation · Difficult

Elite Dangerous
Shared: Space Sim · Simulation · Space

Hardspace: Shipbreaker
Shared: Simulation · Physics · Space

Totally Accurate Battle Simulator
Shared: Simulation · Physics · Realistic

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

Session: Skate Sim
Shared: Simulation · Realistic · Action

Noita
Shared: Physics · Difficult · Simulation

Ostranauts
Shared: Simulation · Space Sim · Flight

House of the Dying Sun
Shared: Simulation · Space Sim · Action

Exo One
Shared: Flight · Physics · Space