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

Balatro
Shared: Roguelike Deckbuilder · Card Game · Roguelike

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

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

9 Kings
Shared: Strategy · Roguelike · Card Game

Dicey Dungeons
Shared: Roguelike Deckbuilder · Roguelike · Card Game

RACCOIN: Coin Pusher Roguelike
Shared: Roguelike Deckbuilder · Roguelike · Strategy

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

Monster Train 2
Shared: Roguelike Deckbuilder · Card Game · Roguelike

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

DICEOMANCER
Shared: Card Game · Roguelike Deckbuilder · Strategy

Meme Mayhem
Shared: Roguelike Deckbuilder · Card Game · Roguelike

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

Hand of Fate
Shared: Roguelike Deckbuilder · Roguelike · Card Game

Chrono Ark
Shared: Roguelike Deckbuilder · Strategy · Card Game

Super Fantasy Kingdom
Shared: Strategy · Roguelike · Card Game

Guild of Dungeoneering Ultimate Edition
Shared: Roguelike Deckbuilder · Roguelike · Card Game

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

Roguebook
Shared: Card Game · Strategy · Roguelike

Wildfrost
Shared: Roguelike Deckbuilder · Card Game · Roguelike

Breachway
Shared: Card Game · Roguelike · Roguelike Deckbuilder

Cobalt Core
Shared: Roguelike Deckbuilder · Card Game · Roguelike

Black Jacket
Shared: Roguelike Deckbuilder · Card Game · Roguelike

Touhou: Lost Branch of Legend
Shared: Roguelike Deckbuilder · Strategy · Roguelike

Monster Train
Shared: Card Game · Roguelike · Roguelike Deckbuilder