Games like One Lonely Outpost
Games like One Lonely Outpost include Stardew Valley, My Time at Portia, Clanfolk, Fields of Mistria, and Oxygen Not Included. We matched them by the tags players give One Lonely Outpost on Steam (Farming Sim, Colony Sim, Sandbox, Indie, and Space): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Farming Sim · Pixel Graphics · Life Sim

My Time at Portia
Shared: Farming Sim · Life Sim · RPG

Clanfolk
Shared: Farming Sim · Life Sim · Pixel Graphics

Fields of Mistria
Shared: Farming Sim · Pixel Graphics · Life Sim

Oxygen Not Included
Shared: Colony Sim · Base Building · Sandbox

Coral Island
Shared: Farming Sim · Life Sim · Agriculture

Forager
Shared: Farming Sim · Indie · Pixel Graphics

Graveyard Keeper
Shared: Pixel Graphics · Sandbox · Indie

Space Engineers
Shared: Sandbox · Space · Building

WorldBox - God Simulator
Shared: Sandbox · Colony Sim · Pixel Graphics

RimWorld
Shared: Colony Sim · Sandbox · Base Building

My Time at Sandrock
Shared: Farming Sim · Life Sim · Sandbox

Terraria
Shared: Sandbox · Pixel Graphics · Indie

I Am Future: Cozy Apocalypse Survival
Shared: Farming Sim · Sandbox · Agriculture

Littlewood
Shared: Life Sim · Pixel Graphics · Sandbox

Sun Haven
Shared: Farming Sim · Pixel Graphics · Life Sim

Dinkum
Shared: Farming Sim · Agriculture · Life Sim

Kerbal Space Program
Shared: Sandbox · Space · Indie

Travellers Rest
Shared: Farming Sim · Life Sim · Pixel Graphics

Space Haven
Shared: Colony Sim · Space · Sandbox

Roots of Pacha
Shared: Farming Sim · Indie · Life Sim

Craft The World
Shared: Colony Sim · Sandbox · Indie

Prison Architect
Shared: Sandbox · Colony Sim · Base Building

Starsand Island
Shared: Farming Sim · Life Sim · Sandbox