Games like Accretion
Games like Accretion include Mount & Blade II: Bannerlord, Arma 3, Arma Reforger, Kerbal Space Program, and Totally Accurate Battle Simulator. We matched them by the tags players give Accretion on Steam (Action, Simulation, Strategy, Action Roguelike, and Space Sim): closest matches first, and among equally close ones the better-known games.

Mount & Blade II: Bannerlord
Shared: Strategy · Open World · Action

Arma 3
Shared: Action · Simulation · Open World

Arma Reforger
Shared: Simulation · Action · Strategy

Kerbal Space Program
Shared: Simulation · Space Sim · Physics

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Physics

We Who Are About To Die
Shared: Action · Strategy · Simulation

Elite Dangerous
Shared: Space Sim · Simulation · Open World

Door Kickers
Shared: Strategy · Simulation · Action

Total Tank Simulator
Shared: Simulation · Action · Strategy

Men of War: Assault Squad 2
Shared: Strategy · Simulation · Action

X4: Foundations
Shared: Simulation · Space Sim · Open World

Arma 2: Operation Arrowhead
Shared: Simulation · Action · Strategy

Drug Dealer Simulator
Shared: Simulation · Action · Open World

BeamNG.drive
Shared: Simulation · Open World · Physics

Goat Simulator
Shared: Simulation · Open World · Action

Universe Sandbox
Shared: Simulation · Space Sim · Physics

X Rebirth
Shared: Simulation · Action · Space Sim

Noita
Shared: Physics · Action · Action Roguelike

911 Operator
Shared: Simulation · Strategy · Real Time Tactics

Hades
Shared: Action Roguelike · Action · Roguelite

Schedule I
Shared: Simulation · Open World · Action

Mount & Blade: Warband
Shared: Strategy · Action · Open World

Between the Stars
Shared: Action · Simulation · Strategy

Ultimate Epic Battle Simulator 2
Shared: Simulation · Action · Strategy