Games like Swallow the Sea
Games like Swallow the Sea include Terraria, Rain World, Once Human, DAVE THE DIVER, and Starbound. We matched them by the tags players give Swallow the Sea on Steam (Action, Free to Play, Adventure, Exploration, and 2D): closest matches first, and among equally close ones the better-known games.

Terraria
Shared: 2D · Adventure · Survival

Rain World
Shared: Exploration · Survival · 2D

Once Human
Shared: Free to Play · Action · Survival

DAVE THE DIVER
Shared: Adventure · Casual · Pixel Graphics

Starbound
Shared: Adventure · Survival · Pixel Graphics

Five Nights at Freddy's: Into the Pit
Shared: Adventure · 2D · Exploration

Forager
Shared: Survival · Pixel Graphics · Adventure

Hyper Light Drifter
Shared: Adventure · Action · Pixel Graphics

A Short Hike
Shared: Exploration · Adventure · Indie

Rise of the Tomb Raider™
Shared: Action · Adventure · Exploration

OneShot
Shared: Pixel Graphics · Indie · Adventure

The Final Station
Shared: Adventure · Action · Pixel Graphics

Escape From Duckov
Shared: Action · Adventure · Exploration

Hollow Knight
Shared: 2D · Exploration · Adventure

The Forest
Shared: Adventure · Survival · Action

Outcore: Desktop Adventure
Shared: Adventure · Free to Play · Exploration

SANABI
Shared: Action · Adventure · Pixel Graphics

Slime Rancher
Shared: Adventure · Exploration · Cute

Dungeon Munchies
Shared: Action · Adventure · Indie

Ori and the Will of the Wisps
Shared: Action · Adventure · Exploration

ANIMAL WELL
Shared: Exploration · Pixel Graphics · 2D

Poppy Playtime
Shared: Free to Play · Adventure · Survival

SUNLESS SEA
Shared: Exploration · Adventure · Survival

We Happy Few
Shared: Adventure · Action · Survival