Games like Paper Kingdom
Games like Paper Kingdom include Stacklands, Cities: Skylines, Oxygen Not Included, Frostpunk, and Banished. We matched them by the tags players give Paper Kingdom on Steam (Card Game, Management, Survival, Card Battler, and City Builder): closest matches first, and among equally close ones the better-known games.

Stacklands
Shared: Card Game · Management · Survival

Cities: Skylines
Shared: Management · City Builder · Building

Oxygen Not Included
Shared: Survival · Management · Building

Frostpunk
Shared: Survival · City Builder · Building

Banished
Shared: City Builder · Survival · Singleplayer

RimWorld
Shared: Survival · Management · Singleplayer

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

Slay the Spire
Shared: Card Game · Card Battler · Singleplayer

Balatro
Shared: Card Game · Singleplayer · Deckbuilding

Jurassic World Evolution
Shared: Management · Building · City Builder

Prison Architect
Shared: Building · Management · City Builder

Manor Lords
Shared: City Builder · Management · Strategy

Planet Zoo
Shared: Management · Building · City Builder

Two Point Hospital
Shared: Management · Building · Singleplayer

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

Cardboard Town
Shared: Card Game · City Builder · Building

Tavern Master
Shared: Management · Building · City Builder

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

Ratropolis
Shared: Card Battler · Card Game · 2D

Settlement Survival
Shared: City Builder · Survival · Management

Project Highrise
Shared: Management · Building · Singleplayer

Against the Storm
Shared: City Builder · Management · Building

Foundation
Shared: City Builder · Management · Building

Game Dev Tycoon
Shared: Management · Singleplayer · Strategy