Games like Museum No.9
Games like Museum No.9 include Stardew Valley, My Time at Portia, DAVE THE DIVER, Home Behind, and Little Witch in the Woods. We matched them by the tags players give Museum No.9 on Steam (Simulation, Casual, Adventure, RPG, and Roguelite): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Simulation · RPG · Life Sim

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

DAVE THE DIVER
Shared: Casual · Adventure · Simulation

Home Behind
Shared: Adventure · RPG · Casual

Little Witch in the Woods
Shared: Casual · Simulation · Cute

Chinese Parents
Shared: Simulation · Casual · Life Sim

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

The Scroll of Taiwu : Beyond The Dome
Shared: RPG · Simulation · Adventure

Graveyard Keeper
Shared: Simulation · RPG · Adventure

Hello Kitty Island Adventure
Shared: Adventure · Simulation · Casual

The Sims™ 4
Shared: Simulation · Life Sim · Casual

Coral Island
Shared: Simulation · Life Sim · RPG

Littlewood
Shared: Simulation · Life Sim · RPG

Cult of the Lamb
Shared: Cute · Roguelite · Base Building

Luma Island
Shared: Casual · Simulation · Adventure

My Time at Sandrock
Shared: Life Sim · RPG · Building

Infinity Nikki
Shared: Casual · RPG · Cute

Sun Haven
Shared: RPG · Life Sim · Adventure

No Place Like Home
Shared: RPG · Simulation · Life Sim

Two Point Museum
Shared: Simulation · Casual · Life Sim

I Am Future: Cozy Apocalypse Survival
Shared: Casual · Simulation · RPG

Melvor Idle
Shared: Casual · RPG · Adventure

DRAPLINE
Shared: Simulation · RPG · Roguelite

Dragon Cliff
Shared: RPG · Casual · Adventure