Games like Neocon Tower Defence 3
Games like Neocon Tower Defence 3 include Thronefall, Bee Island, Oxygen Not Included, Bloons TD 6, and Outpost: Infinity Siege. We matched them by the tags players give Neocon Tower Defence 3 on Steam (Tower Defense, Action RTS, 3D, Futuristic, and Management): closest matches first, and among equally close ones the better-known games.

Thronefall
Shared: Tower Defense · Action RTS · Strategy

Bee Island
Shared: Tower Defense · Action RTS · Base Building

Oxygen Not Included
Shared: Base Building · Resource Management · Management

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

Outpost: Infinity Siege
Shared: Tower Defense · 3D · Base Building

Age of Darkness: Final Stand
Shared: Tower Defense · Action RTS · Base Building

Mindustry
Shared: Tower Defense · Base Building · Resource Management

Tempest Rising
Shared: Base Building · 3D · Singleplayer

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

Taur
Shared: Tower Defense · Base Building · Strategy

Emberward
Shared: Tower Defense · 3D · Base Building

Factorio
Shared: Base Building · Resource Management · Management

Cossacks 3
Shared: Action RTS · Strategy · Resource Management

They Are Billions
Shared: Base Building · Tower Defense · Strategy

Dyson Sphere Program
Shared: Base Building · Resource Management · Management

Cliff Empire
Shared: Futuristic · Strategy · Singleplayer

The Alters
Shared: Management · Base Building · Resource Management

RimWorld
Shared: Base Building · Management · Strategy

Kingdom Rush 6: Genesis TD
Shared: Tower Defense · Action RTS · Strategy

Defense Grid: The Awakening
Shared: Tower Defense · Futuristic · Singleplayer

Diplomacy is Not an Option
Shared: Resource Management · Base Building · Action RTS

Northend Tower Defense
Shared: Tower Defense · Action RTS · Indie

Tower Factory
Shared: Tower Defense · Base Building · Strategy

Kingdom Two Crowns
Shared: Tower Defense · Base Building · Singleplayer