Games like Pyrene
Games like Pyrene include Slay the Spire 2, Slay the Spire, Balatro, Monster Train, and Dice & Fold. We matched them by the tags players give Pyrene on Steam (Turn-Based Combat, Demons, Choices Matter, Roguelike Deckbuilder, and Strategy): closest matches first, and among equally close ones the better-known games.

Slay the Spire 2
Shared: Turn-Based Combat · Strategy · Roguelike Deckbuilder

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

Balatro
Shared: Roguelike Deckbuilder · Strategy · Roguelike

Monster Train
Shared: Card Battler · Deckbuilding · Turn-Based Strategy

Dice & Fold
Shared: Turn-Based Combat · Roguelike Deckbuilder · Card Battler

Vampire Crawlers: The Turbo Wildcard from Vampire Survivors
Shared: Card Battler · Dungeon Crawler · Strategy

Monster Train 2
Shared: Roguelike Deckbuilder · Strategy · Demons

Die in the Dungeon
Shared: Strategy · Turn-Based Combat · Roguelike Deckbuilder

9 Kings
Shared: Strategy · Roguelike Deckbuilder · Turn-Based Combat

Darkest Dungeon®
Shared: Turn-Based Combat · Dungeon Crawler · Roguelike

Hadean Tactics
Shared: Roguelike Deckbuilder · Card Battler · Roguelike

LONESTAR
Shared: Strategy · Turn-Based Combat · Roguelike Deckbuilder

Griftlands
Shared: Choices Matter · Card Battler · Deckbuilding

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

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

Dicey Dungeons
Shared: Roguelike Deckbuilder · Card Battler · Strategy

Vault of the Void
Shared: Roguelike Deckbuilder · Choices Matter · Strategy

Wildfrost
Shared: Roguelike Deckbuilder · Card Battler · Card Game

Deep Sky Derelicts
Shared: Roguelike Deckbuilder · Strategy · Turn-Based Combat

Library Of Ruina
Shared: Turn-Based Combat · Strategy · Deckbuilding

Warhammer 40,000: Chaos Gate - Daemonhunters
Shared: Choices Matter · Turn-Based Strategy · Strategy

Fights in Tight Spaces
Shared: Turn-Based Combat · Strategy · Roguelike Deckbuilder

Decktamer
Shared: Roguelike Deckbuilder · Turn-Based Combat · Card Battler

Breachway
Shared: Strategy · Turn-Based Combat · Roguelike Deckbuilder