Games like Marshmallow Marvin: Grimvault
Games like Marshmallow Marvin: Grimvault include Celeste, Downwell, SANABI, Sonic Origins, and Rogue Legacy 2. We matched them by the tags players give Marshmallow Marvin: Grimvault on Steam (Action, Adventure, Casual, Arcade, and Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Platformer · Indie · Precision Platformer

Downwell
Shared: Action · Platformer · Arcade

SANABI
Shared: Action · Adventure · 2D Platformer

Sonic Origins
Shared: Action · Adventure · 2D Platformer

Rogue Legacy 2
Shared: Action · Arcade · Platformer

Webbed
Shared: 2D Platformer · Platformer · Exploration

Hollow Knight
Shared: Platformer · Indie · Adventure

FEZ
Shared: Platformer · Indie · Adventure

VVVVVV
Shared: Platformer · Indie · Precision Platformer

Super Meat Boy
Shared: Platformer · Indie · Precision Platformer

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

UFO 50
Shared: Action · Indie · Arcade

Sonic Superstars
Shared: Action · Adventure · Platformer

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

Katana ZERO
Shared: Action · Platformer · 2D Platformer

Pikuniku
Shared: Adventure · Casual · Indie

Pizza Tower
Shared: 2D Platformer · Indie · Platformer

Exit the Gungeon
Shared: Action · Arcade · Adventure

Thank Goodness You're Here!
Shared: Adventure · Casual · Exploration

Broforce
Shared: Action · Platformer · Indie

Hollow Knight: Silksong
Shared: Indie · Platformer · Adventure

Skul: The Hero Slayer
Shared: Action · Indie · Platformer

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

Cyberhunt
Shared: Action · Casual · Adventure