Games like Terrarium
Games like Terrarium include Tiny Glade, My Dream Setup, Townscaper, House Flipper, and Town to City. We matched them by the tags players give Terrarium on Steam (Sandbox, Building, Cozy, Design & Illustration, and Relaxing): closest matches first, and among equally close ones the better-known games.

Tiny Glade
Shared: Building · Sandbox · Design & Illustration

My Dream Setup
Shared: Building · Design & Illustration · Sandbox

Townscaper
Shared: Building · Sandbox · Relaxing

House Flipper
Shared: Design & Illustration · Building · Sandbox

Town to City
Shared: Building · Cozy · Relaxing

Garden Galaxy
Shared: Cozy · Sandbox · Idler

Hozy
Shared: Cozy · Sandbox · Relaxing

SUMMERHOUSE
Shared: Sandbox · Relaxing · Building

Furnish Master
Shared: Sandbox · Building · Design & Illustration

Foundation
Shared: Sandbox · Building · City Builder

Small Spaces
Shared: Building · Sandbox · Design & Illustration

Gourdlets
Shared: Sandbox · Building · Relaxing

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

Panelka
Shared: Building · Design & Illustration · Sandbox

Paralives
Shared: Building · Sandbox · Indie

Canvas of Kings
Shared: Sandbox · Building · Design & Illustration

Prison Architect
Shared: Building · Sandbox · Base Building

Planet Coaster
Shared: Building · Sandbox · Relaxing

Stardew Valley
Shared: Sandbox · Relaxing · Building

Dressmaker
Shared: Cozy · Design & Illustration · Relaxing

Cities: Skylines
Shared: Building · Sandbox · City Builder

Garry's Mod
Shared: Sandbox · Building · Casual

Banished
Shared: Sandbox · City Builder · Indie

Minami Lane
Shared: Cute · Relaxing · Cozy