Games like Boogie Fungi
Games like Boogie Fungi include Oxygen Not Included, Prison Architect, RimWorld, Ratopia, and Factorio. We matched them by the tags players give Boogie Fungi on Steam (Creature Collector, Base Building, Sandbox, Colony Sim, and 2D): closest matches first, and among equally close ones the better-known games.

Oxygen Not Included
Shared: Base Building · Colony Sim · Sandbox

Prison Architect
Shared: Sandbox · Base Building · Colony Sim

RimWorld
Shared: Base Building · Colony Sim · Sandbox

Ratopia
Shared: Base Building · Colony Sim · Cute

Factorio
Shared: Base Building · Sandbox · 2D

Timberborn
Shared: Colony Sim · Sandbox · Base Building

Kingdoms and Castles
Shared: Colony Sim · Sandbox · Base Building

Dwarf Fortress
Shared: Base Building · Colony Sim · Sandbox

Cult of the Lamb
Shared: Base Building · Cute · Colony Sim

Academia : School Simulator
Shared: Base Building · Colony Sim · Sandbox

Flotsam
Shared: Base Building · Colony Sim · Sandbox

Manor Lords
Shared: Base Building · Sandbox · City Builder

MyVoiceZoo
Shared: Creature Collector · Sandbox · Casual

Going Medieval
Shared: Base Building · Colony Sim · Sandbox

Two Point Museum
Shared: Sandbox · Casual · Cute

Fabledom
Shared: Colony Sim · Sandbox · City Builder

Stronghold HD (2012)
Shared: Colony Sim · Sandbox · Base Building

Unholy Heights
Shared: Colony Sim · Cute · 2D

shapez
Shared: Base Building · Sandbox · 2D

Space Haven
Shared: Base Building · Colony Sim · Sandbox

Stronghold Crusader HD (2012)
Shared: Colony Sim · Base Building · Sandbox

Against the Storm
Shared: Base Building · Colony Sim · Sandbox

SPORE™
Shared: Sandbox · Colony Sim · Casual

SimCity™ 4 Deluxe Edition
Shared: Base Building · Sandbox · City Builder