Games like Totally Defenceless
Games like Totally Defenceless include Plants vs. Zombies GOTY Edition, Kingdom Rush - Tower Defense, Dungeon Warfare, Bloons TD 6, and GemCraft - Chasing Shadows. We matched them by the tags players give Totally Defenceless on Steam (Tower Defense, Singleplayer, Top-Down, Score Attack, and Strategy): closest matches first, and among equally close ones the better-known games.

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

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

Dungeon Warfare
Shared: Tower Defense · Strategy · Singleplayer

Bloons TD 6
Shared: Tower Defense · Singleplayer · Strategy

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

Infested Planet
Shared: Tower Defense · Strategy · Singleplayer

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

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

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

FTL: Faster Than Light
Shared: Strategy · Singleplayer · Top-Down

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

Dome Keeper
Shared: Singleplayer · Tower Defense · Resource Management

Starship Troopers: Terran Command
Shared: Singleplayer · Strategy · Tactical

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

The Escapists
Shared: Singleplayer · Strategy · Pixel Graphics

Door Kickers
Shared: Top-Down · Strategy · Singleplayer

Aliens: Dark Descent
Shared: Strategy · Singleplayer · Tactical

Warpips
Shared: Tower Defense · Strategy · Singleplayer

Tangy TD
Shared: Tower Defense · Singleplayer · Strategy

Super Sanctum TD
Shared: Tower Defense · Singleplayer · Strategy

Revenge of the Titans
Shared: Tower Defense · Strategy · Singleplayer

Mindustry
Shared: Tower Defense · Resource Management · Strategy

Rise to Ruins
Shared: Tower Defense · Strategy · Pixel Graphics

Relic Guardian - Tower Defense
Shared: Tower Defense · Strategy · Singleplayer