Games like LostEcho
Games like LostEcho include Amanda the Adventurer, Amanda the Adventurer 2, Outer Wilds, Inside the Backrooms, and Amanda the Adventurer 3. We matched them by the tags players give LostEcho on Steam (Adventure, RPG, Interactive Fiction, Puzzle, and 3D Platformer): closest matches first, and among equally close ones the better-known games.

Amanda the Adventurer
Shared: Puzzle · Adventure · First-Person

Amanda the Adventurer 2
Shared: Adventure · Interactive Fiction · Puzzle

Outer Wilds
Shared: Adventure · Exploration · Puzzle

Inside the Backrooms
Shared: Puzzle · Adventure · Exploration

Amanda the Adventurer 3
Shared: Adventure · Interactive Fiction · Puzzle

Fallout 4
Shared: RPG · Adventure · Exploration

Supraland
Shared: Adventure · Exploration · Puzzle

The Exit 8
Shared: Puzzle · Exploration · Adventure

Viewfinder
Shared: Puzzle · Adventure · First-Person

Killer Frequency
Shared: Adventure · Interactive Fiction · Puzzle

Antichamber
Shared: Puzzle · Adventure · Exploration

Legend of Grimrock 2
Shared: RPG · Adventure · Dungeon Crawler

Gothic 1 Remake
Shared: Adventure · RPG · Exploration

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

Who's Lila?
Shared: Interactive Fiction · Puzzle · Exploration

The Room 4: Old Sins
Shared: Adventure · Puzzle · Exploration

Tainted Grail: The Fall of Avalon
Shared: RPG · Adventure · Exploration

Superliminal
Shared: Puzzle · First-Person · Adventure

PEAK
Shared: Adventure · Exploration · 3D

The Elder Scrolls IV: Oblivion Remastered
Shared: RPG · Adventure · Exploration

Lorelei and the Laser Eyes
Shared: Adventure · Puzzle · Exploration

Fallout: New Vegas
Shared: RPG · Adventure · Exploration

The Talos Principle 2
Shared: Puzzle · Exploration · 3D Platformer

Blue Prince
Shared: Puzzle · Exploration · Adventure