Games like Monarchy
Games like Monarchy include Mindustry, Factorio, Oxygen Not Included, Satisfactory, and Kingdom: New Lands. We matched them by the tags players give Monarchy on Steam (Strategy, Exploration, Base Building, Roguelike, and Resource Management): closest matches first, and among equally close ones the better-known games.
Mindustry
Shared: Base Building · Strategy · Resource Management
Factorio
Shared: Base Building · Strategy · Resource Management
Oxygen Not Included
Shared: Base Building · Resource Management · Strategy
Satisfactory
Shared: Base Building · Exploration · Resource Management
Kingdom: New Lands
Shared: Base Building · Exploration · Tower Defense
Tower Dominion
Shared: Strategy · Base Building · Roguelike
Drill Core
Shared: Strategy · Exploration · Tower Defense
The King is Watching
Shared: Base Building · Roguelike · Strategy
Age of Empires II (Retired)
Shared: Strategy · Base Building · Resource Management
Kingdom Two Crowns
Shared: Base Building · Tower Defense · Strategy
The Riftbreaker
Shared: Base Building · Exploration · Tower Defense
They Are Billions
Shared: Strategy · Base Building · Tower Defense
Rogue Tower
Shared: Strategy · Roguelike · Tower Defense
Kingdom Eighties
Shared: Exploration · Side Scroller · Strategy
Prison Architect
Shared: Base Building · Strategy · Building
Bloons TD 6
Shared: Strategy · Tower Defense · Co-op
Wall World
Shared: Strategy · Roguelike · Exploration
Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · 2D
Dome Keeper
Shared: Roguelike · Resource Management · Tower Defense
Thronefall
Shared: Strategy · Tower Defense · Base Building
Age of Empires III: Definitive Edition
Shared: Strategy · Base Building · Resource Management
Frostpunk
Shared: Strategy · Resource Management · Base Building
IXION
Shared: Strategy · Resource Management · Base Building
Grim Nights
Shared: Strategy · Base Building · Tower Defense