Games like Nucvivor
Games like Nucvivor include Rust, Feed and Grow: Fish, The Forest, The Long Dark, and Mount & Blade II: Bannerlord. We matched them by the tags players give Nucvivor on Steam (Indie, Adventure, RPG, Simulation, and Early Access): closest matches first, and among equally close ones the better-known games.

Rust
Shared: Survival · Adventure · Open World

Feed and Grow: Fish
Shared: Simulation · Survival · Indie

The Forest
Shared: Adventure · Survival · Open World

The Long Dark
Shared: Survival · Adventure · First-Person

Mount & Blade II: Bannerlord
Shared: RPG · Open World · Simulation

Don't Starve Together
Shared: Survival · Adventure · Indie

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

Fallout 4
Shared: RPG · Adventure · Singleplayer

鬼谷八荒 Tale of Immortal
Shared: Simulation · RPG · Singleplayer

Thief Simulator
Shared: Simulation · Adventure · Singleplayer

Last Oasis
Shared: RPG · Adventure · Survival

Don't Starve
Shared: Adventure · Indie · Survival

Terraria
Shared: Survival · Adventure · Sandbox

Fallout: New Vegas
Shared: RPG · Singleplayer · Adventure

Slime Rancher
Shared: Adventure · Singleplayer · First-Person

Kenshi
Shared: RPG · Survival · Simulation

ARK: Survival Evolved
Shared: Survival · Adventure · Open World

Bum Simulator
Shared: Adventure · Simulation · Survival

KINGDOMS
Shared: RPG · Survival · Simulation

Raft
Shared: Survival · Adventure · Open World

Mount & Blade: Warband
Shared: RPG · Adventure · Open World

Kingdom Come: Deliverance II
Shared: RPG · Adventure · Singleplayer

Scrap Mechanic
Shared: Survival · Adventure · Sandbox

Tainted Grail: The Fall of Avalon
Shared: RPG · Adventure · First-Person