Games like Samphi
Games like Samphi include Terraria, Stardew Valley, Don't Starve Together, Rust, and Project Zomboid. We matched them by the tags players give Samphi on Steam (RPG, Indie, Early Access, 2D, and Sandbox): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Sandbox · 2D · Multiplayer

Stardew Valley
Shared: RPG · Multiplayer · Sandbox

Don't Starve Together
Shared: Multiplayer · Crafting · Sandbox

Rust
Shared: Crafting · Multiplayer · Sandbox

Project Zomboid
Shared: Sandbox · Multiplayer · Indie

Graveyard Keeper
Shared: RPG · Crafting · Indie

Craftopia
Shared: Crafting · RPG · Sandbox

Magicite
Shared: RPG · Indie · 2D

Forager
Shared: Indie · Crafting · Sandbox

Necesse
Shared: Sandbox · Multiplayer · Indie

Last Oasis
Shared: RPG · Indie · Crafting

Palworld
Shared: Indie · Multiplayer · Crafting

Potion Craft: Alchemist Simulator
Shared: Crafting · Indie · 2D

Don't Starve
Shared: Indie · Crafting · Sandbox

The Scroll of Taiwu : Beyond The Dome
Shared: RPG · Sandbox · Indie

Starbound
Shared: Sandbox · Crafting · Multiplayer

Mount & Blade II: Bannerlord
Shared: RPG · Sandbox · Multiplayer

Medieval Dynasty
Shared: Crafting · Multiplayer · RPG

Edge of Space
Shared: Indie · Sandbox · 2D

Portal Knights
Shared: RPG · Sandbox · Multiplayer

Project: Gorgon
Shared: RPG · Indie · Early Access

Craft The World
Shared: Sandbox · Crafting · Indie

Kenshi
Shared: RPG · Sandbox · Crafting