Games like Active Mummy
Games like Active Mummy include Thank Goodness You're Here!, Rain World, Stray, Webbed, and Momodora: Reverie Under The Moonlight. We matched them by the tags players give Active Mummy on Steam (Adventure, 2D Platformer, Dungeon Crawler, Exploration, and Perma Death): closest matches first, and among equally close ones the better-known games.

Thank Goodness You're Here!
Shared: Adventure · Exploration · 2D Platformer

Rain World
Shared: Exploration · Adventure · Indie

Stray
Shared: Adventure · Exploration · Atmospheric

Webbed
Shared: 2D Platformer · Exploration · Adventure

Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Exploration · Side Scroller

Hollow Knight
Shared: Exploration · Adventure · Indie

Haiku, the Robot
Shared: Adventure · Exploration · 2D Platformer

FAR: Lone Sails
Shared: Adventure · Exploration · Atmospheric

FEZ
Shared: Exploration · Adventure · Indie

Neva
Shared: Adventure · 2D Platformer · Indie

Journey
Shared: Adventure · Exploration · Indie

Prince of Persia The Lost Crown
Shared: 2D Platformer · Exploration · Adventure

Outer Wilds
Shared: Exploration · Adventure · Atmospheric

Hollow Knight: Silksong
Shared: Exploration · Adventure · Indie

LIMBO
Shared: Adventure · Indie · Platformer

A Hat in Time
Shared: Adventure · Collectathon · Exploration

The House of Da Vinci
Shared: Hidden Object · Exploration · Adventure

TOEM: A Photo Adventure
Shared: Adventure · Exploration · Hidden Object

SANABI
Shared: 2D Platformer · Adventure · Indie

Noita
Shared: Dungeon Crawler · Perma Death · Adventure

Celeste
Shared: 2D Platformer · Adventure · Indie

Slime Rancher
Shared: Adventure · Exploration · Cute

Firewatch
Shared: Adventure · Exploration · Atmospheric

Cairn
Shared: Exploration · Adventure · Indie

