Games like Freak☆Ninja Wars
Games like Freak☆Ninja Wars include UNO, Inscryption, Across the Obelisk, Balatro, and Slay the Spire. We matched them by the tags players give Freak☆Ninja Wars on Steam (Board Game, Card Game, Casual, Tactical, and Action): closest matches first, and among equally close ones the better-known games.

UNO
Shared: Card Game · Board Game · Casual

Inscryption
Shared: Card Game · Card Battler · Roguelike

Across the Obelisk
Shared: Casual · Tactical · Card Game

Balatro
Shared: Card Game · Roguelike · Casual

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

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

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

Rento Fortune: Online Dice Board Game (大富翁)
Shared: Board Game · Casual · Card Game

Texas Hold'em Poker: Pokerist
Shared: Card Game · Casual · Board Game

Loop Hero
Shared: Tactical · Roguelike · Card Game

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

Kingdom Rush - Tower Defense
Shared: Tactical · Casual · Action

Wingspan
Shared: Board Game · Card Game · Casual

100% Orange Juice
Shared: Board Game · Card Game · Casual

Knights in Tight Spaces
Shared: Card Game · Card Battler · Turn-Based Tactics

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

StarVaders
Shared: Turn-Based Tactics · Card Game · Board Game

Black Book
Shared: Card Game · Turn-Based Tactics · Card Battler

Tabletop Simulator
Shared: Board Game · Card Game · Casual

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

GWENT: Rogue Mage (Single-Player Expansion)
Shared: Card Game · Board Game · Roguelike

Trials of Fire
Shared: Turn-Based Tactics · Card Battler · Card Game

Heretic's Fork
Shared: Card Game · Action · Tactical

Munchkin Digital
Shared: Board Game · Casual · Card Game