Games like The Guest
Games like The Guest include Chinese Parents, My Time at Portia, Stardew Valley, That's not my Neighbor, and Hello Kitty Island Adventure. We matched them by the tags players give The Guest on Steam (Simulation, Adventure, Casual, Life Sim, and 2D): closest matches first, and among equally close ones the better-known games.

Chinese Parents
Shared: Simulation · Life Sim · Casual

My Time at Portia
Shared: Life Sim · Simulation · Casual

Stardew Valley
Shared: Life Sim · Simulation · RPG

That's not my Neighbor
Shared: Adventure · Casual · Simulation

Hello Kitty Island Adventure
Shared: Adventure · Simulation · Life Sim

Touhou Mystia's Izakaya
Shared: Simulation · Casual · Anime

Disney Dreamlight Valley
Shared: Life Sim · Adventure · Simulation

Sanfu
Shared: Adventure · 2D · Colorful

Volcano Princess
Shared: Life Sim · Simulation · Anime

DAVE THE DIVER
Shared: Casual · Adventure · Simulation

Slime Rancher
Shared: Adventure · Simulation · Colorful

The Sims™ 3
Shared: Simulation · Life Sim · Casual

Streamer Life Simulator
Shared: Simulation · Casual · Life Sim

Melvor Idle
Shared: Casual · Adventure · 2D

Nexomon
Shared: Adventure · Simulation · Casual

Home Behind
Shared: Adventure · Simulation · Casual

Growtopia
Shared: Adventure · Simulation · Casual

[Chillas Art] The Closing Shift
Shared: Simulation · Adventure · Casual

妄想症:Deliver Me
Shared: Adventure · Simulation · Anime

Marco & The Galaxy Dragon
Shared: Adventure · Casual · Anime

PARANORMASIGHT: The Mermaid's Curse
Shared: Adventure · Simulation · Mystery

Youtubers Life
Shared: Life Sim · Simulation · Casual

BidKing
Shared: Simulation · Casual · Life Sim

小白兔电商~Bunny e-Shop
Shared: Simulation · Anime · Life Sim