Games like StarryNight
Games like StarryNight include Mindustry, Oxygen Not Included, They Are Billions, Kingdom Two Crowns, and Bloons TD 6. We matched them by the tags players give StarryNight on Steam (Strategy, Tower Defense, Building, Base Building, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Mindustry
Shared: Tower Defense · Base Building · Strategy

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

They Are Billions
Shared: Strategy · Base Building · Tower Defense

Kingdom Two Crowns
Shared: Tower Defense · Building · Base Building

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

Prison Architect
Shared: Building · Strategy · Base Building

Frostpunk
Shared: Strategy · Resource Management · Building

Factorio
Shared: Base Building · Strategy · Resource Management

Thronefall
Shared: Strategy · Tower Defense · Base Building

Tower Dominion
Shared: Strategy · Tower Defense · Base Building

This War of Mine
Shared: Strategy · Singleplayer · War

Age of Mythology: Retold
Shared: Strategy · Base Building · 3D

Dyson Sphere Program
Shared: Building · Base Building · Resource Management

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

Creeper World 4
Shared: Tower Defense · Building · Strategy

Outpost: Infinity Siege
Shared: Tower Defense · Base Building · 3D

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

Rogue Tower
Shared: Strategy · Tower Defense · Base Building

Manor Lords
Shared: Strategy · Base Building · Building

Cossacks 3
Shared: Strategy · War · Resource Management

Against the Storm
Shared: Strategy · Base Building · Building

Emberward
Shared: Tower Defense · Strategy · Base Building

Minimalist Tower Defense
Shared: Strategy · Tower Defense · Base Building

shapez
Shared: Base Building · Strategy · Resource Management