Games like Square Wars
Games like Square Wars include Monster Train, Slay the Spire, Balatro, Slay the Spire 2, and Inscryption. We matched them by the tags players give Square Wars on Steam (Card Battler, Wargame, Real Time Tactics, Roguelite, and Card Game): closest matches first, and among equally close ones the better-known games.

Monster Train
Shared: Card Battler · Roguelite · Card Game

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

Balatro
Shared: Card Game · Roguelike · Roguelite

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

Inscryption
Shared: Card Battler · Card Game · Roguelite

Stacklands
Shared: Card Battler · Card Game · Roguelite

Ratropolis
Shared: Card Battler · Roguelite · Card Game

9 Kings
Shared: Card Game · Roguelite · Card Battler

Griftlands
Shared: Card Battler · Roguelite · Card Game

WARNO
Shared: Wargame · Real Time Tactics · PvP

NEOVERSE
Shared: Card Battler · Roguelite · Card Game

Morimens
Shared: Card Battler · Roguelite · PvP

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

Wildfrost
Shared: Card Battler · Card Game · Roguelite

Journey to the West
Shared: Card Battler · Roguelite · Card Game

Armello
Shared: PvP · Card Game · Turn-Based Strategy

Dicey Dungeons
Shared: Card Battler · Roguelite · Card Game

One Step From Eden
Shared: Roguelite · Card Battler · Card Game

Tabletop Tavern
Shared: Wargame · Real Time Tactics · Roguelite

Total War: WARHAMMER
Shared: Real Time Tactics · 4X · Strategy

Across the Obelisk
Shared: Card Battler · Card Game · Turn-Based Strategy

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

Root
Shared: Wargame · Tabletop · PvP

Astrea: Six-Sided Oracles
Shared: Card Battler · Card Game · Roguelite