Games like Slice of Sea
Games like Slice of Sea include Gorogoa, Chants of Sennaar, Machinarium, Outer Wilds, and GRIS. We matched them by the tags players give Slice of Sea on Steam (Adventure, Puzzle, Hand-drawn, Exploration, and 2D): closest matches first, and among equally close ones the better-known games.

Gorogoa
Shared: Puzzle · Hand-drawn · Adventure

Chants of Sennaar
Shared: Adventure · Puzzle · Singleplayer

Machinarium
Shared: Puzzle · Hand-drawn · Adventure

Outer Wilds
Shared: Exploration · Adventure · Puzzle

GRIS
Shared: Adventure · Hand-drawn · Atmospheric

Carto
Shared: Puzzle · Exploration · Hand-drawn

Night in the Woods
Shared: Adventure · Exploration · Stylized

Stray
Shared: Adventure · Exploration · Atmospheric

Hollow Knight
Shared: 2D · Exploration · Adventure

Murders on the Yangtze River
Shared: Puzzle · Adventure · Exploration

FAR: Lone Sails
Shared: Adventure · Exploration · Atmospheric

COCOON
Shared: Adventure · Puzzle · Exploration

Creaks
Shared: Puzzle · Hand-drawn · 2D

The Room
Shared: Puzzle · Adventure · Atmospheric

Firewatch
Shared: Adventure · Atmospheric · Exploration

Submachine: Legacy
Shared: Puzzle · Adventure · Hand-drawn

The House of Da Vinci
Shared: Puzzle · Exploration · Adventure

Rusty Lake Paradise
Shared: Puzzle · Adventure · Atmospheric

OneShot
Shared: Puzzle · Adventure · Atmospheric

Old Man's Journey
Shared: Adventure · Hand-drawn · Puzzle

Hollow Knight: Silksong
Shared: 2D · Exploration · Adventure

Sally Face - Episode One
Shared: Puzzle · Adventure · Hand-drawn

Blue Prince
Shared: Puzzle · Exploration · Adventure

Sanfu
Shared: Puzzle · Adventure · 2D