Games like Terminal squad: Swarmites
Games like Terminal squad: Swarmites include Creeper World 3: Arc Eternal, They Are Billions, Infested Planet, Taur, and Aliens: Dark Descent. We matched them by the tags players give Terminal squad: Swarmites on Steam (Indie, Strategy, Action, RTS, and Tower Defense): closest matches first, and among equally close ones the better-known games.

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

They Are Billions
Shared: Strategy · Base Building · RTS

Infested Planet
Shared: Strategy · Action · Indie

Taur
Shared: Strategy · Action · Indie

Aliens: Dark Descent
Shared: Strategy · Action · RTS

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

Oxygen Not Included
Shared: Base Building · Survival · Strategy

Command & Conquer Red Alert™ 2 and Yuri’s Revenge™
Shared: Strategy · Action · RTS

RimWorld
Shared: Strategy · Base Building · Survival

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

Halo Wars: Definitive Edition
Shared: Strategy · RTS · Base Building

Warhammer 40,000: Dawn of War III
Shared: Strategy · RTS · Action

Door Kickers
Shared: Strategy · Indie · Action

Planetary Annihilation: TITANS
Shared: Strategy · RTS · Base Building

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

Defense Grid: The Awakening
Shared: Strategy · Indie · Tower Defense

Door Kickers 2: Task Force North
Shared: Action · Strategy · Top-Down

Company of Heroes 2
Shared: Strategy · RTS · Military

Infection Free Zone
Shared: Strategy · Base Building · RTS

Mindustry
Shared: Tower Defense · Strategy · Base Building

Heat Signature
Shared: Indie · Action · Strategy

The Riftbreaker
Shared: Base Building · Tower Defense · Survival

GemCraft - Chasing Shadows
Shared: Strategy · Indie · Tower Defense

STAR WARS™ Galactic Battlegrounds Saga
Shared: Strategy · Action · RTS