Games like Boku Boku
Games like Boku Boku include Terraria, Stardew Valley, Garry's Mod, People Playground, and Tiny Glade. We matched them by the tags players give Boku Boku on Steam (2D, Pixel Graphics, Cozy, Building, and Sandbox): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: 2D · Sandbox · Pixel Graphics

Stardew Valley
Shared: Pixel Graphics · Multiplayer · Sandbox

Garry's Mod
Shared: Sandbox · Moddable · Building

People Playground
Shared: Sandbox · 2D · Moddable

Tiny Glade
Shared: Building · Cozy · Sandbox

Graveyard Keeper
Shared: Pixel Graphics · Crafting · Sandbox

Starbound
Shared: Sandbox · Pixel Graphics · Crafting

Forager
Shared: Pixel Graphics · 2D · Crafting

Factorio
Shared: Sandbox · Crafting · Building

Palia
Shared: Cozy · Building · Multiplayer

Necesse
Shared: Pixel Graphics · Sandbox · Multiplayer

Rust
Shared: Crafting · Building · Sandbox

Fields of Mistria
Shared: Pixel Graphics · Cute · 2D

The Sims™ 3
Shared: Building · Sandbox · Character Customization

gogh: Focus with Your Avatar
Shared: Sandbox · Cozy · Cute

My Dream Setup
Shared: Building · Sandbox · Cozy

The Escapists 2
Shared: Pixel Graphics · 2D · Multiplayer

Core Keeper
Shared: Pixel Graphics · Sandbox · Building

The Sims™ 4
Shared: Building · Character Customization · Sandbox

King Arthur's Gold
Shared: 2D · Pixel Graphics · Building

Littlewood
Shared: Pixel Graphics · Sandbox · Building

Moonstone Island
Shared: 2D · Pixel Graphics · Sandbox

Luma Island
Shared: Cozy · Building · Crafting

Trove
Shared: Pixel Graphics · Sandbox · Building