Games like AsteroidTD
Games like AsteroidTD include FTL: Faster Than Light, Heat Signature, Aliens: Dark Descent, Kingdom Rush - Tower Defense, and Door Kickers. We matched them by the tags players give AsteroidTD on Steam (Strategy, Action, Tower Defense, Space, and Tactical): closest matches first, and among equally close ones the better-known games.

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

Heat Signature
Shared: Space · Action · Strategy

Aliens: Dark Descent
Shared: Strategy · Action · Tactical

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Tactical

Door Kickers
Shared: Strategy · Tactical · Action

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

Heretic's Fork
Shared: Strategy · Tower Defense · Action

Door Kickers 2: Task Force North
Shared: Tactical · Action · Strategy

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

Crying Suns
Shared: Strategy · Space · Roguelike

Yokai Art: Night Parade of One Hundred Demons
Shared: Strategy · Tower Defense · Roguelite

Cluckmech Oasis
Shared: Strategy · Tower Defense · Roguelike

Tangy TD
Shared: Strategy · Tower Defense · Action

Infested Planet
Shared: Strategy · Action · Tower Defense

Taur
Shared: Strategy · Tower Defense · Action

Creeper World 4
Shared: Tower Defense · Strategy · Space

Tower Dominion
Shared: Strategy · Tower Defense · Tactical

Drill Core
Shared: Strategy · Tower Defense · Roguelite

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

Wall World
Shared: Tower Defense · Strategy · Roguelite

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

The King is Watching
Shared: Tower Defense · Strategy · Roguelike

Battlevoid: Harbinger
Shared: Strategy · Space · Action

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · Tactical