Games like The Riftbreaker
Games like The Riftbreaker include Enshrouded, Valheim, The Riftbreaker: Prologue, 7 Days to Die, and Raft. We matched them by the tags players give The Riftbreaker on Steam (Base Building, Online Co-Op, Multiplayer, Tower Defense, and Survival): closest matches first, and among equally close ones the better-known games.

Enshrouded
Shared: Base Building · Multiplayer · Online Co-Op

Valheim
Shared: Online Co-Op · Survival · Multiplayer

The Riftbreaker: Prologue
Shared: Online Co-Op · Base Building · Multiplayer

7 Days to Die
Shared: Multiplayer · Survival · Base Building

Raft
Shared: Multiplayer · Survival · Base Building

Terraria
Shared: Multiplayer · Survival · Sandbox

Green Hell
Shared: Multiplayer · Online Co-Op · Survival

Palworld
Shared: Multiplayer · Survival · Online Co-Op

Core Keeper
Shared: Survival · Multiplayer · Exploration

Once Human
Shared: Multiplayer · Survival · Base Building

ICARUS
Shared: Base Building · Multiplayer · Survival

Rust
Shared: Multiplayer · Survival · Crafting

Sons Of The Forest
Shared: Multiplayer · Survival · Base Building

Grounded
Shared: Multiplayer · Base Building · Survival

Abiotic Factor
Shared: Online Co-Op · Base Building · Survival

V Rising
Shared: Base Building · Survival · Multiplayer

ARK: Survival Evolved
Shared: Multiplayer · Survival · Base Building

ARK: Survival Ascended
Shared: Multiplayer · Base Building · Survival

Satisfactory
Shared: Base Building · Multiplayer · Crafting

Don't Starve Together
Shared: Multiplayer · Survival · Online Co-Op

Scrap Mechanic
Shared: Multiplayer · Survival · Base Building

Dune: Awakening
Shared: Base Building · Survival · Exploration

Conan Exiles Enhanced
Shared: Survival · Multiplayer · Building

Night of the Dead
Shared: Multiplayer · Tower Defense · Online Co-Op