Games like Platformer
Games like Platformer include Terraria, Starbound, Forager, Rust, and The Forest. We matched them by the tags players give Platformer on Steam (Sandbox, Survival, 2D, Fantasy, and Combat): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: Sandbox · Survival · 2D

Starbound
Shared: Sandbox · Survival · Open World Survival Craft

Forager
Shared: Survival · Sandbox · Open World Survival Craft

Rust
Shared: Survival · Sandbox · Open World Survival Craft

The Forest
Shared: Survival · Open World Survival Craft · Sandbox

Don't Starve Together
Shared: Survival · Open World Survival Craft · Sandbox

Necesse
Shared: Sandbox · Survival · Open World Survival Craft

Core Keeper
Shared: Survival · Sandbox · Pixel Graphics

Valheim
Shared: Survival · Open World Survival Craft · Sandbox

ARK: Survival Evolved
Shared: Survival · Open World Survival Craft · Sandbox

Don't Starve
Shared: Survival · Sandbox · Open World Survival Craft

Conan Exiles Enhanced
Shared: Survival · Sandbox · Open World Survival Craft

Dune: Awakening
Shared: Survival · Sandbox · Open World Survival Craft

Project Zomboid
Shared: Survival · Sandbox · Open World Survival Craft

Raft
Shared: Survival · Open World Survival Craft · Sandbox

Palworld
Shared: Survival · Open World Survival Craft · Sandbox

Portal Knights
Shared: Sandbox · Survival · Adventure

Tinkerlands
Shared: Sandbox · Survival · Open World Survival Craft

7 Days to Die
Shared: Survival · Open World Survival Craft · Sandbox

Blasphemous 2
Shared: Fantasy · Combat · 2D Platformer

The Long Dark
Shared: Survival · Open World Survival Craft · Sandbox

TerraTech
Shared: Sandbox · Open World Survival Craft · Survival

Enshrouded
Shared: Survival · Fantasy · Adventure

Craftopia
Shared: Survival · Sandbox · Open World Survival Craft