Games like MMY: Otherworld Mystery
Games like MMY: Otherworld Mystery include LIMBO, Planet of Lana, Pinstripe, Human Fall Flat, and Nihilumbra. We matched them by the tags players give MMY: Otherworld Mystery on Steam (Casual, Action, Adventure, Puzzle, and Side Scroller): closest matches first, and among equally close ones the better-known games.

LIMBO
Shared: Puzzle · Puzzle Platformer · Adventure

Planet of Lana
Shared: Action · Puzzle Platformer · Puzzle

Pinstripe
Shared: Casual · Adventure · Puzzle Platformer

Human Fall Flat
Shared: Puzzle · Adventure · Action

Nihilumbra
Shared: Adventure · Casual · Puzzle

Little Nightmares
Shared: Adventure · Atmospheric · Puzzle Platformer

Seen
Shared: Adventure · Puzzle · Action

Pikuniku
Shared: Casual · Adventure · Puzzle

Unravel
Shared: Action · Adventure · Puzzle

Valiant Hearts: The Great War™ / Soldats Inconnus : Mémoires de la Grande Guerre™
Shared: Adventure · Atmospheric · Puzzle

Little Nightmares II
Shared: Adventure · Puzzle · Atmospheric

Zup! 2
Shared: Casual · Puzzle · 2D

BADLAND: Game of the Year Edition
Shared: Adventure · Action · 2D

The Swapper
Shared: Puzzle · Adventure · Puzzle Platformer

DARQ: Complete Edition
Shared: Adventure · Puzzle · Puzzle Platformer

Oddworld: New 'n' Tasty
Shared: Adventure · Puzzle Platformer · Puzzle

Tomb Raider Game of the Year
Shared: Action · Adventure · Puzzle

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

Portal
Shared: Puzzle · Puzzle Platformer · Action

ANIMAL WELL
Shared: Puzzle · Puzzle Platformer · Adventure

Max: The Curse of Brotherhood
Shared: Adventure · Action · Puzzle

Scribblenauts Unlimited
Shared: Casual · Puzzle · Adventure

BOKURA: planet
Shared: Action · Casual · Adventure

Portal 2
Shared: Puzzle · Puzzle Platformer · Action