Games like Crustacean Nations
Games like Crustacean Nations include Cossacks 3, Age of Mythology: Retold, Tempest Rising, Age of Empires III: Definitive Edition, and Thronefall. We matched them by the tags players give Crustacean Nations on Steam (Strategy, Casual, Action RTS, Base Building, and Stylized): closest matches first, and among equally close ones the better-known games.

Cossacks 3
Shared: Strategy · RTS · Base Building

Age of Mythology: Retold
Shared: Strategy · Base Building · RTS

Tempest Rising
Shared: Strategy · Base Building · RTS

Age of Empires III: Definitive Edition
Shared: Strategy · Base Building · RTS

Thronefall
Shared: Strategy · Action RTS · Base Building

Age of Darkness: Final Stand
Shared: Action RTS · Strategy · Base Building

Totally Accurate Battle Simulator
Shared: Strategy · Funny · Singleplayer

Mini Motorways
Shared: Strategy · Casual · Stylized

Factorio
Shared: Base Building · Strategy · Resource Management

Bee Island
Shared: Strategy · Action RTS · Base Building

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

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

Bloons TD 6
Shared: Strategy · Casual · Singleplayer

Planetary Annihilation: TITANS
Shared: Strategy · Base Building · RTS

Diplomacy is Not an Option
Shared: Base Building · Resource Management · Action RTS

Oxygen Not Included
Shared: Base Building · Resource Management · Strategy

They Are Billions
Shared: Strategy · Base Building · RTS

Command & Conquer 3 Tiberium Wars™
Shared: Strategy · RTS · Base Building

Mindustry
Shared: Base Building · Strategy · RTS

Command & Conquer™ Remastered Collection
Shared: Strategy · Base Building · RTS

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

Plants vs. Zombies GOTY Edition
Shared: Strategy · Casual · Singleplayer

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

Star Birds
Shared: Base Building · Casual · Stylized