Games like Space Adventure TD
Games like Space Adventure TD include Bloons TD 6, Plants vs. Zombies GOTY Edition, Kingdom Rush 5: Alliance TD, Kingdom Rush - Tower Defense, and Defense Grid: The Awakening. We matched them by the tags players give Space Adventure TD on Steam (Early Access, Strategy, Tower Defense, Singleplayer, and Indie): closest matches first, and among equally close ones the better-known games.

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

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

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · Singleplayer

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

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

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

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

Orcs Must Die!
Shared: Tower Defense · Strategy · Indie

Plague Inc: Evolved
Shared: Strategy · Singleplayer · Indie

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Tower Defense · Singleplayer

Kingdom Two Crowns
Shared: Tower Defense · Singleplayer · Strategy

Orcs Must Die! 2
Shared: Tower Defense · Strategy · Indie

Rise to Ruins
Shared: Tower Defense · Strategy · Indie

Dungeon Defenders
Shared: Tower Defense · Strategy · Singleplayer

Castle Story
Shared: Strategy · Tower Defense · Indie

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

Infested Planet
Shared: Strategy · Tower Defense · Indie

Dungeon Warfare
Shared: Strategy · Tower Defense · Indie

Kingdom Rush Vengeance - Tower Defense
Shared: Strategy · Tower Defense · Singleplayer

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

Warpips
Shared: Strategy · Tower Defense · Singleplayer

Emberward
Shared: Tower Defense · Strategy · Indie

Sanctum 2
Shared: Tower Defense · Strategy · Indie

Rock 'N' Roll Defense
Shared: Strategy · Tower Defense · Indie