Games like NUNNA
Games like NUNNA include Slay the Spire, Balatro, Slay the Spire 2, Monster Train, and Wildfrost. We matched them by the tags players give NUNNA on Steam (Card Battler, Strategy, Turn-Based Tactics, Roguelite, and Card Game): closest matches first, and among equally close ones the better-known games.

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

Balatro
Shared: Card Game · Strategy · Roguelite

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

Monster Train
Shared: Card Battler · Roguelite · Turn-Based Tactics

Wildfrost
Shared: Card Battler · Turn-Based Tactics · Card Game

Inscryption
Shared: Card Battler · Card Game · Strategy

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

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

Dream of Corpse Lady
Shared: Strategy · Card Battler · Card Game

9 Kings
Shared: Strategy · Card Game · Roguelite

Ratropolis
Shared: Card Battler · Strategy · 2D

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

Roguebook
Shared: Card Game · Strategy · Roguelite

Into the Breach
Shared: Strategy · Turn-Based Tactics · Pixel Graphics

Dicey Dungeons
Shared: Card Battler · Roguelite · Strategy

Loop Hero
Shared: Roguelite · Pixel Graphics · Card Game

Stacklands
Shared: Card Battler · Card Game · Roguelite

Super Fantasy Kingdom
Shared: Strategy · Roguelite · Card Game

Cross Blitz
Shared: Roguelite · Card Battler · Strategy

Alina of the Arena
Shared: Turn-Based Tactics · Strategy · Card Game

LONESTAR
Shared: Strategy · Card Battler · Turn-Based Tactics

Griftlands
Shared: Card Battler · Roguelite · Strategy

As We Descend
Shared: Card Battler · Card Game · Turn-Based Tactics

Combolands: Roguelike Citybuilder
Shared: Strategy · Roguelite · 2D