Games like Crab God
Games like Crab God include Oxygen Not Included, RimWorld, This War of Mine, Banished, and Frostpunk. We matched them by the tags players give Crab God on Steam (Singleplayer, Roguelike, Strategy, Side Scroller, and Underwater): closest matches first, and among equally close ones the better-known games.

Oxygen Not Included
Shared: Singleplayer · Survival · Resource Management

RimWorld
Shared: Strategy · Singleplayer · Survival

This War of Mine
Shared: Singleplayer · Strategy · Survival

Banished
Shared: Strategy · Singleplayer · Indie

Frostpunk
Shared: Strategy · Survival · Singleplayer

They Are Billions
Shared: Strategy · Survival · Singleplayer

FTL: Faster Than Light
Shared: Roguelike · Strategy · Singleplayer

Going Medieval
Shared: Strategy · Singleplayer · Survival

Rise to Ruins
Shared: Strategy · Tower Defense · Survival

Kingdom: New Lands
Shared: Roguelike · Tower Defense · Survival

Dawn of Man
Shared: Strategy · Singleplayer · Survival

Frostpunk 2
Shared: Strategy · Singleplayer · Survival

Home Behind
Shared: Singleplayer · Indie · Strategy

Creeper World 3: Arc Eternal
Shared: Strategy · Singleplayer · Indie

Subnautica: Below Zero
Shared: Singleplayer · Underwater · Survival

Dungeon of the ENDLESS™
Shared: Roguelike · Strategy · Indie

Dwarf Fortress
Shared: Strategy · Roguelike · Colony Sim

Balatro
Shared: Roguelike · Singleplayer · Strategy

Kingdom Two Crowns
Shared: Singleplayer · Tower Defense · Strategy

Feed and Grow: Fish
Shared: Underwater · Singleplayer · Survival

Endzone - A World Apart
Shared: Strategy · Survival · Indie

Insurmountable
Shared: Singleplayer · Strategy · Roguelike

Don't Starve
Shared: Singleplayer · Survival · Indie

Stoneshard
Shared: Roguelike · Strategy · Singleplayer