Games like Tin Hearts
Games like Tin Hearts include Portal 2, The Last Campfire, Before Your Eyes, FAR: Lone Sails, and Supraland. We matched them by the tags players give Tin Hearts on Steam (Lemmings, Emotional, Adventure, Singleplayer, and Puzzle): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Singleplayer · Puzzle · Puzzle Platformer

The Last Campfire
Shared: Adventure · Puzzle · Singleplayer

Before Your Eyes
Shared: Emotional · Singleplayer · Narrative

FAR: Lone Sails
Shared: Adventure · Singleplayer · Exploration

Supraland
Shared: Adventure · Puzzle Platformer · Exploration

Ori and the Will of the Wisps
Shared: Singleplayer · Adventure · Platformer

Little Nightmares
Shared: Adventure · Singleplayer · Puzzle Platformer

Viewfinder
Shared: Puzzle · Puzzle Platformer · Singleplayer

Brothers - A Tale of Two Sons
Shared: Adventure · Emotional · Puzzle

COCOON
Shared: Adventure · Puzzle · Exploration

LIMBO
Shared: Puzzle Platformer · Puzzle · Adventure

Portal
Shared: Puzzle · Puzzle Platformer · Singleplayer

FEZ
Shared: Puzzle · Singleplayer · Adventure

Outer Wilds
Shared: Adventure · Exploration · Puzzle

Monument Valley
Shared: Adventure · Puzzle · Singleplayer

Little Nightmares II
Shared: Adventure · Singleplayer · Puzzle

Song of Nunu: A League of Legends Story
Shared: Adventure · Puzzle · Singleplayer

Riven
Shared: Adventure · Puzzle · Singleplayer

Blue Prince
Shared: Puzzle · Singleplayer · Exploration

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

Seen
Shared: Adventure · Singleplayer · Puzzle

To the Moon
Shared: Emotional · Adventure · Singleplayer

Chants of Sennaar
Shared: Adventure · Puzzle · Singleplayer

INSIDE
Shared: Puzzle Platformer · Singleplayer · Adventure