Games like A-Spec First Assault
Games like A-Spec First Assault include VTOL VR, STAR WARS™: Squadrons, Uncrashed : FPV Drone Simulator, Kerbal Space Program, and SpaceEngine. We matched them by the tags players give A-Spec First Assault on Steam (Sci-fi, 6DOF, Space Sim, Flight, and Physics): closest matches first, and among equally close ones the better-known games.

VTOL VR
Shared: Flight · Combat · Realistic

STAR WARS™: Squadrons
Shared: Flight · Sci-fi · Singleplayer

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

Kerbal Space Program
Shared: Physics · Space Sim · Simulation

SpaceEngine
Shared: Sci-fi · Space Sim · Realistic

Hardspace: Shipbreaker
Shared: Sci-fi · Physics · Space Sim

Flight Of Nova
Shared: Space Sim · Sci-fi · Flight

Universe Sandbox
Shared: Space Sim · Physics · Realistic

EVERSPACE™
Shared: Sci-fi · Space Sim · Flight

War Thunder
Shared: Flight · Combat · Simulation

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

Elite Dangerous
Shared: Space Sim · Sci-fi · Simulation

Totally Accurate Battle Simulator
Shared: Physics · Realistic · Simulation

House of the Dying Sun
Shared: Space Sim · Sci-fi · Flight

Starpoint Gemini 2
Shared: Sci-fi · Space Sim · Simulation

Half Sword
Shared: Physics · Combat · Realistic

FTL: Faster Than Light
Shared: Sci-fi · Singleplayer · Space

Dome Keeper
Shared: Sci-fi · Singleplayer · Combat

V: Rings of Saturn
Shared: Sci-fi · Physics · Space Sim

X4: Foundations
Shared: Space Sim · Sci-fi · Simulation

Starfield
Shared: Sci-fi · Singleplayer · Character Customization

Project Wingman
Shared: Flight · Action · Singleplayer

X-Plane 11
Shared: Flight · Realistic · Physics

Nuclear Option
Shared: Flight · Physics · Simulation