Games like Hitstun
Games like Hitstun include Shadowverse: Worlds Beyond, Slay the Spire 2, Animation Throwdown: The Quest for Cards, Yu-Gi-Oh! Legacy of the Duelist, and ROUNDS. We matched them by the tags players give Hitstun on Steam (Card Game, Trading Card Game, 2D Fighter, Card Battler, and Turn-Based Tactics): closest matches first, and among equally close ones the better-known games.

Shadowverse: Worlds Beyond
Shared: Trading Card Game · Card Battler · Card Game

Slay the Spire 2
Shared: Card Game · Card Battler · Turn-Based Combat

Animation Throwdown: The Quest for Cards
Shared: Trading Card Game · Card Game · Card Battler

Yu-Gi-Oh! Legacy of the Duelist
Shared: Card Game · Card Battler · Trading Card Game

ROUNDS
Shared: 2D Fighter · Action · Card Battler

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

Your Only Move Is HUSTLE
Shared: 2D Fighter · Action · Turn-Based Tactics

Magic: The Gathering Arena
Shared: Card Game · Trading Card Game · Deckbuilding

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

Marvels Midnight Suns Digital Edition
Shared: Turn-Based Tactics · Card Game · Turn-Based Combat

Yu-Gi-Oh! Legacy of the Duelist : Link Evolution
Shared: Trading Card Game · Card Game · Card Battler

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

GWENT: The Witcher Card Game
Shared: Card Game · Trading Card Game · Deckbuilding

SUPER DRAGON BALL HEROES WORLD MISSION
Shared: Card Game · Card Battler · Anime

Griftlands
Shared: Card Battler · Card Game · Choices Matter

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

Inscryption
Shared: Card Game · Card Battler · Deckbuilding

Balatro
Shared: Card Game · Deckbuilding · Card Battler

DRAGON BALL FighterZ
Shared: 2D Fighter · Action · Anime

GUILTY GEAR -STRIVE-
Shared: 2D Fighter · Anime · Action

JoJo's Bizarre Adventure: All-Star Battle R
Shared: Action · Anime · 2D Fighter

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

Dream of Corpse Lady
Shared: Card Game · Card Battler · Turn-Based Tactics

9 Kings
Shared: Card Game · Card Battler · Turn-Based Combat