Games like 万界之门
Games like 万界之门 include Slay the Spire 2, Slay the Spire, Balatro, Inscryption, and 9 Kings. We matched them by the tags players give 万界之门 on Steam (Card Battler, Strategy, Roguelite, Card Game, and Roguelike): closest matches first, and among equally close ones the better-known games.

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

Slay the Spire
Shared: Card Battler · Card Game · Roguelike

Balatro
Shared: Card Game · Roguelike · Strategy

Inscryption
Shared: Card Battler · Card Game · Deckbuilding

9 Kings
Shared: Strategy · Card Game · Roguelike

Griftlands
Shared: Card Battler · Roguelite · Card Game

Monster Train
Shared: Card Battler · Roguelite · Card Game

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

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

Ratropolis
Shared: Card Battler · Roguelite · Strategy

Dicey Dungeons
Shared: Card Battler · Roguelite · Roguelike

Super Fantasy Kingdom
Shared: Strategy · Roguelite · Roguelike

Stacklands
Shared: Card Game · Card Battler · Roguelite

Dungeons & Degenerate Gamblers
Shared: Strategy · Roguelike · Card Battler

Breachway
Shared: Strategy · Card Game · Roguelike

Roguebook
Shared: Card Game · Strategy · Roguelite

DICEOMANCER
Shared: Strategy · Card Battler · Card Game

天外武林 (Traveler of Wuxia)
Shared: Roguelike · Card Battler · Card Game

Library Of Ruina
Shared: Strategy · Card Game · Turn-Based Combat

Ballionaire
Shared: Strategy · 2D · Roguelike

My Card Is Better Than Your Card!
Shared: Card Game · Roguelike · Strategy

Astrea: Six-Sided Oracles
Shared: Card Battler · Card Game · Strategy

Loop Hero
Shared: Roguelike · Roguelite · Deckbuilding

Wildfrost
Shared: Card Battler · Card Game · Roguelite