Games like Siege of Centauri
Games like Siege of Centauri include Thronefall, Element TD 2 - Tower Defense, Legion TD 2 - Multiplayer Tower Defense, Creeper World 4, and Age of Darkness: Final Stand. We matched them by the tags players give Siege of Centauri on Steam (Tower Defense, Real Time Tactics, PvE, Competitive, and Real-Time): closest matches first, and among equally close ones the better-known games.

Thronefall
Shared: Tower Defense · Strategy · 3D

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

Legion TD 2 - Multiplayer Tower Defense
Shared: Tower Defense · Strategy · Competitive

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

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

Orcs Must Die! 3
Shared: Tower Defense · PvE · Strategy

Taur
Shared: Tower Defense · Strategy · Real Time Tactics

Predecessor
Shared: Competitive · PvE · Action

DG2: Defense Grid 2
Shared: Tower Defense · Strategy · Real Time Tactics

Age of Mythology: Retold
Shared: Strategy · 3D · Base Building

Tempest Rising
Shared: Strategy · Real-Time · Base Building

Shadow Tactics: Blades of the Shogun
Shared: Real Time Tactics · Strategy · Isometric

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

Rogue Tower
Shared: Tower Defense · Strategy · 3D

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

Bee Island
Shared: Tower Defense · Strategy · 3D

Emberward
Shared: Tower Defense · Strategy · 3D

Mindustry
Shared: Tower Defense · Strategy · Base Building

Stronghold Crusader: Definitive Edition
Shared: Real Time Tactics · Strategy · Tower Defense

Warhammer 40,000: Dawn of War - Anniversary Edition (Classic)
Shared: Strategy · Real-Time · Base Building

Axon TD: Uprising - Tower Defense
Shared: Tower Defense · Real Time Tactics · PvE

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

Out of Ammo
Shared: Tower Defense · Real Time Tactics · Strategy

Northend Tower Defense
Shared: Tower Defense · Strategy · Real Time Tactics