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

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

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

Balatro
Shared: Roguelike Deckbuilder · Roguelike · Card Game

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

Wildfrost
Shared: Roguelike Deckbuilder · Card Battler · Turn-Based Tactics

StarVaders
Shared: Roguelike Deckbuilder · Turn-Based Tactics · Roguelite

9 Kings
Shared: Roguelike Deckbuilder · Roguelike · Roguelite

LONESTAR
Shared: Turn-Based Tactics · Roguelike Deckbuilder · Roguelike

Alina of the Arena
Shared: Roguelike Deckbuilder · Turn-Based Tactics · Roguelike

As We Descend
Shared: Roguelike Deckbuilder · Card Battler · Roguelike

Dicey Dungeons
Shared: Roguelike Deckbuilder · Roguelite · Card Battler

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

Monster Train 2
Shared: Roguelike Deckbuilder · Roguelike · Turn-Based Tactics

Black Jacket
Shared: Roguelike Deckbuilder · Roguelike · Roguelite

Astrea: Six-Sided Oracles
Shared: Roguelike Deckbuilder · Card Battler · Roguelike

Dungeons & Degenerate Gamblers
Shared: Roguelike Deckbuilder · Roguelike · Roguelite

Breachway
Shared: Roguelike Deckbuilder · Roguelike · Roguelite

Gambonanza
Shared: Roguelike Deckbuilder · Chess · Replay Value

Super Fantasy Kingdom
Shared: Roguelike · Roguelite · Roguelike Deckbuilder

Banners of Ruin
Shared: Roguelike Deckbuilder · Roguelike · Card Battler

Shogun Showdown
Shared: Roguelike · Roguelike Deckbuilder · Replay Value

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

Inscryption
Shared: Card Battler · Card Game · Roguelike

Touhou: Lost Branch of Legend
Shared: Roguelike Deckbuilder · Roguelike · Card Battler