Games like Starlight: Defence Command
Games like Starlight: Defence Command include Creeper World 3: Arc Eternal, Mindustry, Starship Troopers: Terran Command, Infested Planet, and Taur. We matched them by the tags players give Starlight: Defence Command on Steam (Tower Defense, Sci-fi, Character Customization, Immersive, and Strategy): closest matches first, and among equally close ones the better-known games.

Creeper World 3: Arc Eternal
Shared: Tower Defense · Strategy · Sci-fi

Mindustry
Shared: Tower Defense · Resource Management · Strategy

Starship Troopers: Terran Command
Shared: Strategy · Sci-fi · Resource Management

Infested Planet
Shared: Tower Defense · Strategy · Sci-fi

Taur
Shared: Tower Defense · Strategy · Sci-fi

Defense Grid: The Awakening
Shared: Tower Defense · Sci-fi · Strategy

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Strategy · 2D

Aliens: Dark Descent
Shared: Strategy · Sci-fi · Real Time Tactics

XCOM 2
Shared: Strategy · Character Customization · Sci-fi

DG2: Defense Grid 2
Shared: Tower Defense · Sci-fi · Strategy

Bloons TD 6
Shared: Tower Defense · Strategy · Singleplayer

Kingdom Rush - Tower Defense
Shared: Tower Defense · Strategy · 2D

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

FTL: Faster Than Light
Shared: Sci-fi · Strategy · Indie

Anno 2070™
Shared: Strategy · Resource Management · Futuristic

Dungeon Warfare
Shared: Tower Defense · Strategy · 2D

Cliff Empire
Shared: Sci-fi · Strategy · Futuristic

Planetary Annihilation: TITANS
Shared: Strategy · Sci-fi · Real Time Tactics

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

Oxygen Not Included
Shared: Resource Management · 2D · Strategy

GemCraft - Chasing Shadows
Shared: Tower Defense · Strategy · 2D

XCOM®: Chimera Squad
Shared: Strategy · Sci-fi · Character Customization

Warhammer 40,000: Dawn of War II - Anniversary Edition (Classic)
Shared: Sci-fi · Strategy · RTS

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