Games like MMX
Games like MMX include LIMBO, Rogue Legacy 2, Skul: The Hero Slayer, Hollow Knight, and Defy Gravity Extended. We matched them by the tags players give MMX on Steam (Indie, Action, Adventure, 2D, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

LIMBO
Shared: Indie · Puzzle Platformer · 2D

Rogue Legacy 2
Shared: Action · Indie · Adventure

Skul: The Hero Slayer
Shared: Indie · Action · 2D

Hollow Knight
Shared: Indie · 2D · Platformer

Defy Gravity Extended
Shared: Indie · Puzzle Platformer · 2D

Rogue Legacy
Shared: Indie · Action · Platformer

BEEP
Shared: Indie · Adventure · 2D

Vampire Survivors
Shared: Indie · 2D · Singleplayer

Dust: An Elysian Tail
Shared: Action · Indie · Adventure

Shovel Knight: Treasure Trove
Shared: Indie · Platformer · 2D

Pikuniku
Shared: Indie · Adventure · Casual

Dungeon Munchies
Shared: Indie · Action · Adventure

Broforce
Shared: Action · 2D · Indie

Mark of the Ninja
Shared: Indie · Action · 2D

ICEY
Shared: Action · Indie · Adventure

Hollow Knight: Silksong
Shared: Indie · 2D · Singleplayer

MO:Astray
Shared: Indie · Action · Adventure

SANABI
Shared: Action · Adventure · Indie

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

Planet of Lana
Shared: Action · Puzzle Platformer · Indie

Nihilumbra
Shared: Indie · Adventure · Puzzle Platformer

Deadlight
Shared: Action · Indie · Adventure

Super Fancy Pants Adventure
Shared: Action · Indie · Adventure

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