Games like Lunar Mountain
Games like Lunar Mountain include Hollow Knight, SANABI, Ori and the Will of the Wisps, Planet of Lana, and Mark of the Ninja. We matched them by the tags players give Lunar Mountain on Steam (Action, Adventure, Platformer, 2D Platformer, and 2D): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · 2D · Adventure

SANABI
Shared: Action · Adventure · 2D Platformer

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

Planet of Lana
Shared: Action · 2D Platformer · Atmospheric

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

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

LIMBO
Shared: Platformer · Adventure · Atmospheric

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

Deadlight
Shared: Action · Platformer · Adventure

Celeste
Shared: Platformer · 2D Platformer · 2D

BEEP
Shared: Adventure · Platformer · 2D

Rain World
Shared: Atmospheric · Platformer · 2D

Super Meat Boy
Shared: Platformer · 2D Platformer · 2D

Rogue Legacy 2
Shared: Action · Platformer · Adventure

Dead Cells
Shared: Adventure · 2D · Platformer

Neva
Shared: Adventure · Platformer · Atmospheric

GRIS
Shared: Adventure · Atmospheric · Platformer

Nine Sols
Shared: Action · Platformer · 2D

Rayman® Legends
Shared: Adventure · Platformer · Action

Pizza Tower
Shared: 2D Platformer · Platformer · Action

Katana ZERO
Shared: Action · Platformer · 2D Platformer

Brothers - A Tale of Two Sons
Shared: Adventure · Atmospheric · Controller

Sonic Superstars
Shared: Action · Platformer · Adventure

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