Games like Dream Boundary
Games like Dream Boundary include Slay the Spire 2, Balatro, Slay the Spire, Vampire Crawlers: The Turbo Wildcard from Vampire Survivors, and Die in the Dungeon. We matched them by the tags players give Dream Boundary on Steam (Strategy, Card Battler, Card Game, Roguelike, and 2D): closest matches first, and among equally close ones the better-known games.

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

Balatro
Shared: Card Game · Roguelike · Strategy

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

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

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

9 Kings
Shared: Strategy · Roguelike · Card Game

Inscryption
Shared: Card Battler · Card Game · Roguelike

Super Fantasy Kingdom
Shared: Strategy · Roguelike · Card Game

Stoneshard
Shared: Strategy · Roguelike · Pixel Graphics

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

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

Ratropolis
Shared: Card Battler · Strategy · 2D

Breachway
Shared: Strategy · Card Game · Roguelike

Loop Hero
Shared: Roguelike · Pixel Graphics · Card Game

Roguebook
Shared: Card Game · Strategy · Indie

Griftlands
Shared: Card Battler · Card Game · Strategy

The Binding of Isaac: Rebirth
Shared: Roguelike · Indie · Pixel Graphics

DICEOMANCER
Shared: Strategy · Card Battler · Card Game

Stray Path
Shared: Strategy · Card Battler · Card Game

Yu-Gi-Oh! Master Duel
Shared: Strategy · Card Game · Card Battler

Monster Train
Shared: Card Battler · Card Game · Roguelike

Darkest Dungeon®
Shared: Turn-Based Combat · Roguelike · Strategy

Stacklands
Shared: Card Game · Card Battler · Strategy

He is Coming
Shared: Strategy · Roguelike · Card Game