Games like Heroic Assault
Games like Heroic Assault include Thronefall, Kingdom Rush - Tower Defense, GemCraft - Chasing Shadows, Aliens: Dark Descent, and Bloons TD 6. We matched them by the tags players give Heroic Assault on Steam (Strategy, Top-Down, Tower Defense, Action, and Medieval): closest matches first, and among equally close ones the better-known games.

Thronefall
Shared: Strategy · Tower Defense · Medieval

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

GemCraft - Chasing Shadows
Shared: Strategy · Tower Defense · Top-Down

Aliens: Dark Descent
Shared: Strategy · Action · Top-Down

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

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

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

Kingdom Rush 6: Genesis TD
Shared: Strategy · Tower Defense · Action

Total War: WARHAMMER III
Shared: Strategy · Fantasy · Action

Crimson Desert Enhanced
Shared: Action · Singleplayer · Fantasy

GemCraft - Frostborn Wrath
Shared: Tower Defense · Strategy · Top-Down

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · 3D

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

Total War: WARHAMMER II
Shared: Strategy · Fantasy · Action

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

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

Artisan TD
Shared: Strategy · Tower Defense · Fantasy

Mount & Blade II: Bannerlord
Shared: Strategy · Medieval · Action

Border Pioneer
Shared: Strategy · Tower Defense · Medieval

Tiny Tactics
Shared: Strategy · Tower Defense · Top-Down

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

Door Kickers
Shared: Strategy · Top-Down · Action

Kingdom Two Crowns
Shared: Tower Defense · Strategy · Medieval

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

