Games like ASCII Tower Defense
Games like ASCII Tower Defense include Bloons TD 6, Plants vs. Zombies GOTY Edition, Kingdom Rush - Tower Defense, Kingdom Rush 5: Alliance TD, and Kingdom Rush Frontiers - Tower Defense. We matched them by the tags players give ASCII Tower Defense on Steam (Strategy, Tower Defense, PvE, 2D, and Singleplayer): 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 - Tower Defense
Shared: Strategy · Tower Defense · 2D

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · 2D

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

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

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

Mindustry
Shared: Tower Defense · Strategy · 2D

Bloons TD 5
Shared: Strategy · Tower Defense · Singleplayer

Orcs Must Die! 3
Shared: Tower Defense · Strategy · PvE

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

Dungeon Defenders
Shared: Tower Defense · Strategy · Singleplayer

Dungeon Warfare
Shared: Strategy · Tower Defense · 2D

Kingdom Rush 6: Genesis TD
Shared: Strategy · Tower Defense · 2D

Tangy TD
Shared: Strategy · Tower Defense · Singleplayer

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

Sir, We Have an Orc Problem
Shared: Tower Defense · PvE · Strategy

Rock 'N' Roll Defense
Shared: Strategy · Tower Defense · 2D

Company of Heroes 3
Shared: Strategy · Singleplayer · PvE

Holo vs Robo
Shared: Strategy · Tower Defense · Singleplayer

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Singleplayer

Infested Planet
Shared: Strategy · Tower Defense · Singleplayer

XCOM 2
Shared: Strategy · Singleplayer · PvE

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · PvE