Games like Lonely House
Games like Lonely House include Townscaper, Slime Rancher 2, Tiny Glade, Planet Coaster, and My Dream Setup. We matched them by the tags players give Lonely House on Steam (Cute, Relaxing, Atmospheric, Casual, and Sandbox): closest matches first, and among equally close ones the better-known games.

Townscaper
Shared: Relaxing · Sandbox · Building

Slime Rancher 2
Shared: Cute · Relaxing · Singleplayer

Tiny Glade
Shared: Relaxing · Building · Cute

Planet Coaster
Shared: Relaxing · Building · Sandbox

My Dream Setup
Shared: Relaxing · Building · Sandbox

Unpacking
Shared: Cute · Relaxing · Casual

The Sims™ 4
Shared: Building · Relaxing · Sandbox

House Flipper
Shared: Relaxing · Simulation · Building

SUMMERHOUSE
Shared: Relaxing · Sandbox · Casual

Hozy
Shared: Relaxing · Casual · Cute

Paralives
Shared: Building · Simulation · Indie

Equilinox
Shared: Relaxing · Casual · Indie

LEGO® Builder's Journey
Shared: Cute · Relaxing · Casual

Stardew Valley
Shared: Relaxing · Sandbox · Simulation

Cities: Skylines II
Shared: Sandbox · Building · Simulation

Placid Plastic Duck Simulator
Shared: Cute · Relaxing · Casual

Sticky Business
Shared: Relaxing · Cute · Casual

PowerWash Simulator
Shared: Relaxing · Casual · Simulation

Garry's Mod
Shared: Sandbox · Building · Casual

Farm Together
Shared: Relaxing · Casual · Simulation

PC Building Simulator
Shared: Simulation · Building · Sandbox

Slime Rancher
Shared: Cute · Sandbox · Singleplayer

Megaquarium
Shared: Casual · Sandbox · Building

Chill with You : Lo-Fi Story
Shared: Relaxing · Atmospheric · Casual