Games like Portobugia
Games like Portobugia include Frostpunk, Cities: Skylines, Kingdoms and Castles, Farthest Frontier, and Manor Lords. We matched them by the tags players give Portobugia on Steam (Resource Management, City Builder, Strategy, Sailing, and Perma Death): closest matches first, and among equally close ones the better-known games.

Frostpunk
Shared: City Builder · Resource Management · Strategy

Cities: Skylines
Shared: City Builder · Strategy · Building

Kingdoms and Castles
Shared: City Builder · Resource Management · Strategy

Farthest Frontier
Shared: City Builder · Resource Management · Strategy

Manor Lords
Shared: City Builder · Strategy · Resource Management

Banished
Shared: City Builder · Strategy · Survival

Cities: Skylines II
Shared: City Builder · Building · Strategy

Tavern Master
Shared: Resource Management · Strategy · Management

Foundation
Shared: City Builder · Strategy · Resource Management

Against the Storm
Shared: Strategy · City Builder · Resource Management

Jurassic World Evolution
Shared: Strategy · Building · City Builder

IXION
Shared: City Builder · Strategy · Resource Management

Ostriv
Shared: City Builder · Strategy · Resource Management

Oxygen Not Included
Shared: Resource Management · Survival · Building

Workers & Resources: Soviet Republic
Shared: City Builder · Strategy · Building

Settlement Survival
Shared: City Builder · Building · Survival

Jurassic World Evolution 2
Shared: Building · Strategy · City Builder

Factorio
Shared: Resource Management · Strategy · Survival

Frostpunk 2
Shared: City Builder · Strategy · Resource Management

Anno 1800
Shared: City Builder · Strategy · Resource Management

Transport Fever 2
Shared: Strategy · City Builder · Management

Endzone - A World Apart
Shared: City Builder · Strategy · Survival

Prison Architect
Shared: Strategy · Building · City Builder

Empires of the Undergrowth
Shared: Strategy · City Builder · Building