Games like Mushroom Wars
Games like Mushroom Wars include Plants vs. Zombies GOTY Edition, Age of Empires II (Retired), Bloons TD 6, Kingdom Rush - Tower Defense, and Mushroom Wars 2. We matched them by the tags players give Mushroom Wars on Steam (Strategy, Action, Indie, RTS, and Multiplayer): closest matches first, and among equally close ones the better-known games.

Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · 2D

Age of Empires II (Retired)
Shared: Strategy · RTS · Multiplayer

Bloons TD 6
Shared: Strategy · Multiplayer · Tower Defense

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

Mushroom Wars 2
Shared: Strategy · Action · RTS

Warhammer 40,000: Dawn of War III
Shared: Strategy · RTS · Action

Plague Inc: Evolved
Shared: Strategy · Indie · Multiplayer

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

STAR WARS™ Empire at War - Gold Pack
Shared: Strategy · RTS · Multiplayer

Company of Heroes 2
Shared: Strategy · RTS · Multiplayer

Door Kickers
Shared: Strategy · Action · Indie

Bloons TD 5
Shared: Strategy · Action · Tower Defense

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

Infested Planet
Shared: Strategy · Action · RTS

GemCraft - Chasing Shadows
Shared: Strategy · Indie · Action

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

Men of War: Assault Squad 2
Shared: Strategy · RTS · Action

Call to Arms
Shared: Strategy · Action · RTS

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

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

STAR WARS™ Galactic Battlegrounds Saga
Shared: Strategy · Action · RTS

Command & Conquer Red Alert™ 2 and Yuri’s Revenge™
Shared: Strategy · Action · RTS

Town of Salem
Shared: Strategy · Multiplayer · Indie

Age of Mythology: Extended Edition
Shared: Strategy · RTS · Multiplayer