Games like Space Tower Defense
Games like Space Tower Defense include Creeper World 4, Total War: WARHAMMER III, Total War: WARHAMMER II, Aliens: Dark Descent, and Broken Arrow. We matched them by the tags players give Space Tower Defense on Steam (Strategy, RTS, Tower Defense, Real Time Tactics, and Top-Down): closest matches first, and among equally close ones the better-known games.

Creeper World 4
Shared: Tower Defense · Real Time Tactics · RTS

Total War: WARHAMMER III
Shared: Strategy · RTS · Real Time Tactics

Total War: WARHAMMER II
Shared: Strategy · RTS · Fantasy

Aliens: Dark Descent
Shared: Strategy · RTS · Real Time Tactics

Broken Arrow
Shared: Strategy · RTS · Real Time Tactics

Age of Darkness: Final Stand
Shared: Tower Defense · RTS · Strategy

Bad North: Jotunn Edition
Shared: Tower Defense · Real Time Tactics · RTS

Battlefleet Gothic: Armada 2
Shared: Strategy · RTS · Real Time Tactics

Age of Mythology: Retold
Shared: Strategy · RTS · 3D

Planetary Annihilation: TITANS
Shared: Strategy · RTS · Real Time Tactics

Artisan TD
Shared: Strategy · Tower Defense · Real Time Tactics

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

DG2: Defense Grid 2
Shared: Strategy · Tower Defense · RTS

Bloons TD 6
Shared: Strategy · Tower Defense · 3D

Warhammer Age of Sigmar: Realms of Ruin
Shared: Strategy · RTS · Real Time Tactics

Creeper World 3: Arc Eternal
Shared: Strategy · Tower Defense · RTS

Last Train Home
Shared: Strategy · RTS · Real Time Tactics

Call to Arms - Gates of Hell: Ostfront
Shared: Strategy · Real Time Tactics · RTS

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

Total War: THREE KINGDOMS
Shared: Strategy · RTS · War

Kingdom Heroes 8
Shared: RTS · Real Time Tactics · Strategy

Element TD 2 - Tower Defense
Shared: Tower Defense · Real Time Tactics · Strategy

Warpips
Shared: Strategy · RTS · Tower Defense

Thronefall
Shared: Strategy · Tower Defense · 3D