Games like Gaia Project
Games like Gaia Project include Dorfromantik, Sid Meier's Civilization®: Beyond Earth™, Richman 11, Terraforming Mars, and Bloons TD 6. We matched them by the tags players give Gaia Project on Steam (Strategy, Casual, Board Game, Turn-Based Strategy, and Family Friendly): closest matches first, and among equally close ones the better-known games.

Dorfromantik
Shared: Casual · Strategy · Turn-Based Strategy

Sid Meier's Civilization®: Beyond Earth™
Shared: Strategy · Turn-Based Strategy · Space

Richman 11
Shared: Casual · Board Game · Family Friendly

Terraforming Mars
Shared: Strategy · Board Game · Space

Bloons TD 6
Shared: Strategy · Casual · Family Friendly

UNO
Shared: Board Game · Casual · Strategy

XCOM®: Chimera Squad
Shared: Strategy · Turn-Based Strategy · Aliens

Armello
Shared: Board Game · Turn-Based Strategy · PvP

Wingspan
Shared: Board Game · Strategy · Casual

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

ENDLESS Space™ - Definitive Edition
Shared: Strategy · Turn-Based Strategy · Space

XCOM: Enemy Unknown
Shared: Strategy · Turn-Based Strategy · Aliens

ENDLESS Space™ 2
Shared: Strategy · Turn-Based Strategy · Space

Carcassonne - Tiles and Tactics
Shared: Strategy · Board Game · Casual

Hasbro's BATTLESHIP
Shared: Board Game · Strategy · Casual

BattleTech
Shared: Strategy · Turn-Based Strategy · Sci-fi

Sid Meier’s Civilization® VI
Shared: Strategy · Turn-Based Strategy · Singleplayer

Plague Inc: Evolved
Shared: Strategy · Casual · Singleplayer

Clue/Cluedo: Classic Edition
Shared: Strategy · Board Game · Casual

Rento Fortune: Online Dice Board Game (大富翁)
Shared: Casual · Strategy · Board Game

100% Orange Juice
Shared: Board Game · Strategy · Casual

Gremlins, Inc.
Shared: Board Game · Strategy · Turn-Based Strategy

Dota Underlords
Shared: Strategy · Casual · Board Game

FTL: Faster Than Light
Shared: Strategy · Space · Singleplayer