Games like Tower Defense Ultimate: Crashfall Protocol
Games like Tower Defense Ultimate: Crashfall Protocol include Aliens: Dark Descent, Age of Darkness: Final Stand, DG2: Defense Grid 2, Company of Heroes 3, and Bloons TD 6. We matched them by the tags players give Tower Defense Ultimate: Crashfall Protocol on Steam (Tower Defense, Strategy, Singleplayer, Action RTS, and Real Time Tactics): closest matches first, and among equally close ones the better-known games.

Aliens: Dark Descent
Shared: Strategy · Real Time Tactics · Singleplayer

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · Action RTS

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

Company of Heroes 3
Shared: Strategy · Singleplayer · Action RTS

Bloons TD 6
Shared: Tower Defense · Strategy · Singleplayer

Warhammer 40,000: Dawn of War - Definitive Edition
Shared: Strategy · Singleplayer · RTS

Thronefall
Shared: Tower Defense · Strategy · Action RTS

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

Infested Planet
Shared: Tower Defense · Strategy · Singleplayer

Broken Arrow
Shared: Strategy · Real Time Tactics · Action RTS

Taur
Shared: Tower Defense · Strategy · Singleplayer

Cossacks 3
Shared: Strategy · RTS · Singleplayer

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

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

Call to Arms - Gates of Hell: Ostfront
Shared: Strategy · Real Time Tactics · Singleplayer

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

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

Age of Mythology: Retold
Shared: Strategy · RTS · 3D

Creeper World 4
Shared: Tower Defense · Real Time Tactics · Strategy

Total War: WARHAMMER II
Shared: Strategy · RTS · Singleplayer

Planetary Annihilation: TITANS
Shared: Strategy · Real Time Tactics · RTS

Bee Island
Shared: Tower Defense · Strategy · Action RTS

Total War: WARHAMMER III
Shared: Strategy · Real Time Tactics · RTS

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