Games like Marshmallow Melee
Games like Marshmallow Melee include Hades, UnderMine, Hades II, Ancient Dungeon, and Mount & Blade II: Bannerlord. We matched them by the tags players give Marshmallow Melee on Steam (Strategy, Indie, Early Access, Adventure, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Indie · Action Roguelike · Action

UnderMine
Shared: Action Roguelike · Indie · RPG

Hades II
Shared: Action · Action Roguelike · Roguelite

Ancient Dungeon
Shared: Adventure · Indie · VR

Mount & Blade II: Bannerlord
Shared: Strategy · RPG · Action

Streets of Rogue
Shared: Action Roguelike · Indie · RPG

Gunfire Reborn
Shared: Indie · Roguelite · Action

Heroes of Hammerwatch II
Shared: Action Roguelike · RPG · Action

Dreamscaper
Shared: Indie · Action Roguelike · Action

The Scroll of Taiwu : Beyond The Dome
Shared: Strategy · RPG · Indie

VR Dungeon Knight
Shared: Adventure · Indie · RPG

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

Heroes of Hammerwatch
Shared: Action Roguelike · Indie · Roguelite

Sands of Salzaar
Shared: Strategy · Indie · RPG

Notes of Soul
Shared: Adventure · Indie · Action

Juicy Realm
Shared: Indie · Adventure · Action

The Binding of Isaac
Shared: Indie · Action Roguelike · Action

We Who Are About To Die
Shared: Strategy · Action · RPG

Vampire Survivors
Shared: Action Roguelike · Indie · Roguelite

Home Behind 2
Shared: Strategy · Adventure · Indie

Legioncraft
Shared: Strategy · Indie · Adventure

Dungreed
Shared: Action Roguelike · Indie · Action

Overdungeon
Shared: Strategy · Indie · RPG

Delver
Shared: Indie · Action Roguelike · RPG