Games like Agestan
Games like Agestan include Slay the Spire 2, Balatro, Slay the Spire, 9 Kings, and Inscryption. We matched them by the tags players give Agestan on Steam (Strategy, Card Game, Roguelike, PvE, and Casual): closest matches first, and among equally close ones the better-known games.

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

Balatro
Shared: Card Game · Roguelike · Strategy

Slay the Spire
Shared: Card Game · Roguelike · Strategy

9 Kings
Shared: Strategy · Roguelike · Card Game

Inscryption
Shared: Card Game · Roguelike · Strategy

Monster Train
Shared: Card Game · Roguelike · Strategy

Die in the Dungeon
Shared: Strategy · Roguelike · Card Game

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

Dungeons & Degenerate Gamblers
Shared: Strategy · Roguelike · Card Game

Super Fantasy Kingdom
Shared: Strategy · Roguelike · Card Game

GWENT: The Witcher Card Game
Shared: Card Game · Strategy · PvP

Roguebook
Shared: Card Game · Strategy · Indie

Griftlands
Shared: Card Game · Strategy · Card Battler

He is Coming
Shared: Strategy · Roguelike · Card Game

DICEOMANCER
Shared: Strategy · Card Game · Roguelike

Dicey Dungeons
Shared: Roguelike · Strategy · Card Game

Breachway
Shared: Strategy · Card Game · Roguelike

The Bazaar
Shared: Strategy · Card Game · PvP

Ratropolis
Shared: Strategy · Card Game · Deckbuilding

Loop Hero
Shared: Roguelike · Card Game · Indie

RACCOIN: Coin Pusher Roguelike
Shared: Strategy · Roguelike · Casual

Gordian Quest
Shared: Card Game · Strategy · Card Battler

Mount & Blade II: Bannerlord
Shared: Strategy · Medieval · PvP

Library Of Ruina
Shared: Card Game · Strategy · Deckbuilding