Games like Become the Moon
Games like Become the Moon include Slay the Spire 2, Slay the Spire, Balatro, 9 Kings, and Monster Train. We matched them by the tags players give Become the Moon on Steam (Auto Battler, Deckbuilding, Difficult, Roguelike, and Card Game): closest matches first, and among equally close ones the better-known games.

Slay the Spire 2
Shared: Deckbuilding · Roguelike · Card Game

Slay the Spire
Shared: Deckbuilding · Card Game · Roguelike

Balatro
Shared: Deckbuilding · Roguelike · Card Game

9 Kings
Shared: Auto Battler · Roguelike · Deckbuilding

Monster Train
Shared: Deckbuilding · Card Game · Roguelike

Super Fantasy Kingdom
Shared: Auto Battler · Roguelike · Strategy

Wildfrost
Shared: Difficult · Card Game · Deckbuilding

Die in the Dungeon
Shared: Deckbuilding · Roguelike · Card Game

He is Coming
Shared: Auto Battler · Roguelike · Strategy

Dicey Dungeons
Shared: Deckbuilding · Roguelike Deckbuilder · Roguelike

Library Of Ruina
Shared: Difficult · Deckbuilding · Card Game

Inscryption
Shared: Deckbuilding · Card Game · Card Battler

Hadean Tactics
Shared: Auto Battler · Roguelike · Deckbuilding

Vampire Crawlers: The Turbo Wildcard from Vampire Survivors
Shared: Deckbuilding · Roguelike · Card Battler

Breachway
Shared: Deckbuilding · Roguelike · Card Game

The Bazaar
Shared: Auto Battler · Deckbuilding · Strategy

Monster Train 2
Shared: Deckbuilding · Roguelike · Card Game

Dungeons & Degenerate Gamblers
Shared: Roguelike · Deckbuilding · Roguelike Deckbuilder

StarVaders
Shared: Deckbuilding · Difficult · Roguelike Deckbuilder

Roguebook
Shared: Deckbuilding · Card Game · Roguelike

Astrea: Six-Sided Oracles
Shared: Roguelike · Card Game · Roguelike Deckbuilder

Ratropolis
Shared: Deckbuilding · Card Game · Card Battler

Alina of the Arena
Shared: Roguelike · Roguelike Deckbuilder · Card Game

Commander Quest
Shared: Card Game · Deckbuilding · Roguelike Deckbuilder