Games like Battlevoid: Sector Siege
Games like Battlevoid: Sector Siege include FTL: Faster Than Light, Door Kickers, Stellaris, STAR WARS™ Empire at War - Gold Pack, and Aliens: Dark Descent. We matched them by the tags players give Battlevoid: Sector Siege on Steam (Strategy, Indie, Action, Simulation, and Space): closest matches first, and among equally close ones the better-known games.

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

Door Kickers
Shared: Strategy · Simulation · Action

Stellaris
Shared: Strategy · Space · Simulation

STAR WARS™ Empire at War - Gold Pack
Shared: Strategy · Space · RTS

Aliens: Dark Descent
Shared: Strategy · Action · RTS

Cosmoteer: Starship Architect & Commander
Shared: Indie · Strategy · Space

Plague Inc: Evolved
Shared: Strategy · Indie · Simulation

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

Battlefleet Gothic: Armada (Classic)
Shared: Strategy · Space · RTS

SPORE™ Galactic Adventures
Shared: Action · Simulation · Space

Particle Fleet: Emergence
Shared: Strategy · Indie · Simulation

Call to Arms
Shared: Strategy · Action · RTS

Reassembly
Shared: Strategy · Space · Action

Heat Signature
Shared: Indie · Space · Strategy

Infested Planet
Shared: Strategy · Action · Indie

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Indie · Tactical

Battlevoid: Harbinger
Shared: Strategy · Simulation · Indie

Sins of a Solar Empire®: Rebellion
Shared: Strategy · Simulation · Space

Creeper World 3: Arc Eternal
Shared: Strategy · Indie · RTS

Sins of a Solar Empire II
Shared: Strategy · Space · RTS

Game Dev Tycoon
Shared: Indie · Strategy · Simulation

Nexus - The Jupiter Incident
Shared: Strategy · Space · Simulation

Iron Marines
Shared: Strategy · RTS · Action

The Escapists
Shared: Strategy · Indie · Simulation