Games like Nightpark Journal
Games like Nightpark Journal include Slay the Spire, Balatro, Slay the Spire 2, 9 Kings, and Dicey Dungeons. We matched them by the tags players give Nightpark Journal on Steam (Roguelike Deckbuilder, Card Battler, Replay Value, Strategy, and Roguelite): closest matches first, and among equally close ones the better-known games.

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

Balatro
Shared: Roguelike Deckbuilder · Roguelike · Strategy

Slay the Spire 2
Shared: Roguelike Deckbuilder · Roguelike · Strategy

9 Kings
Shared: Strategy · Roguelike Deckbuilder · Roguelike

Dicey Dungeons
Shared: Roguelike Deckbuilder · Card Battler · Roguelite

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

Die in the Dungeon
Shared: Strategy · Roguelike Deckbuilder · Roguelike

Super Fantasy Kingdom
Shared: Strategy · Roguelike · Roguelite

Monster Train
Shared: Card Battler · Roguelite · Deckbuilding

Inscryption
Shared: Card Battler · Deckbuilding · Card Game

Griftlands
Shared: Card Battler · Roguelite · Deckbuilding

Chrono Ark
Shared: Roguelike Deckbuilder · Strategy · RPG

Gordian Quest
Shared: Card Battler · Strategy · Replay Value

Wildfrost
Shared: Roguelike Deckbuilder · Card Battler · Roguelite

Breachway
Shared: Strategy · Roguelike Deckbuilder · Roguelike

Yao-Guai Hunter
Shared: Roguelike Deckbuilder · Replay Value · Card Battler

Roguebook
Shared: RPG · Strategy · Deckbuilding

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

Overdungeon
Shared: Roguelike Deckbuilder · Strategy · Card Battler

As We Descend
Shared: Roguelike Deckbuilder · Card Battler · Roguelike

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

Deathless. The Hero Quest
Shared: Roguelike Deckbuilder · Replay Value · Card Battler

LONESTAR
Shared: Card Battler · Strategy · Roguelike Deckbuilder

Ratropolis
Shared: Card Battler · Strategy · Roguelite