Games like HammerHelm
Games like HammerHelm include Rust, The Forest, Once Human, Conan Exiles Enhanced, and ARK: Survival Evolved. We matched them by the tags players give HammerHelm on Steam (Building, Action, Casual, Action-Adventure, and Crafting): closest matches first, and among equally close ones the better-known games.

Rust
Shared: Crafting · Building · Open World

The Forest
Shared: Building · Crafting · Open World

Once Human
Shared: Action · Open World · Building

Conan Exiles Enhanced
Shared: Building · Open World · Crafting

ARK: Survival Evolved
Shared: Building · Crafting · Open World

Crimson Desert Enhanced
Shared: Action · Open World · Fantasy

Valheim
Shared: Building · Open World · Crafting

Hogwarts Legacy
Shared: Fantasy · Open World · Adventure

Middle-earth: Shadow of War
Shared: Action · Open World · Fantasy

Dragon's Dogma 2
Shared: Action · Open World · Fantasy

My Time at Portia
Shared: Crafting · Casual · Open World

The Witcher 3: Wild Hunt — Remastered
Shared: Open World · Fantasy · Adventure

Where Winds Meet
Shared: Open World · Action-Adventure · Fantasy

Middle-earth™: Shadow of Mordor™
Shared: Action · Open World · Fantasy

Raft
Shared: Building · Crafting · Open World

Marvel’s Spider-Man Remastered
Shared: Action · Open World · Action-Adventure

ARK: Survival Ascended
Shared: Building · Open World · Crafting

TerraTech
Shared: Building · Open World · Action

Monster Hunter: World
Shared: Action · Open World · Fantasy

Terraria
Shared: Building · Crafting · Open World Survival Craft

Slime Rancher 2
Shared: Open World · Casual · Colorful

Planet Coaster
Shared: Building · Strategy · Simulation

Rise of the Tomb Raider™
Shared: Action · Action-Adventure · Adventure

Scrap Mechanic
Shared: Building · Crafting · Open World