Games like Oldowan
Games like Oldowan include Valheim, Terraria, Rust, ARK: Survival Evolved, and Raft. We matched them by the tags players give Oldowan on Steam (Open World Survival Craft, Survival, Multiplayer, Open World, and Adventure): closest matches first, and among equally close ones the better-known games.

Valheim
Shared: Open World Survival Craft · Survival · Open World

Terraria
Shared: Open World Survival Craft · Survival · Multiplayer

Rust
Shared: Survival · Multiplayer · Open World Survival Craft

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

Raft
Shared: Survival · Open World Survival Craft · Multiplayer

Palworld
Shared: Survival · Open World · Open World Survival Craft

ASTRONEER
Shared: Open World Survival Craft · Multiplayer · Open World

Once Human
Shared: Open World · Multiplayer · Survival

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

ICARUS
Shared: Open World Survival Craft · Survival · Multiplayer

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

Satisfactory
Shared: Open World · Multiplayer · Crafting

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

Grounded
Shared: Survival · Multiplayer · Open World Survival Craft

Green Hell
Shared: Open World Survival Craft · Survival · Multiplayer

Sons Of The Forest
Shared: Survival · Multiplayer · Open World

Enshrouded
Shared: Survival · Open World · Multiplayer

Subnautica
Shared: Open World Survival Craft · Survival · Open World

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

Starbound
Shared: Open World Survival Craft · Survival · Adventure

Stranded Deep
Shared: Open World Survival Craft · Survival · Multiplayer

RuneScape: Dragonwilds
Shared: Survival · Open World Survival Craft · Open World

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

No Man's Sky
Shared: Open World Survival Craft · Open World · Survival