Games like Aethercrypt
Games like Aethercrypt include Monster Train, Slay the Spire, 9 Kings, Journey to the West, and Cross Blitz. We matched them by the tags players give Aethercrypt on Steam (RPG, Strategy, Party-Based RPG, Card Game, and Turn-Based Strategy): closest matches first, and among equally close ones the better-known games.

Monster Train
Shared: Card Game · Card Battler · Roguelite

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

9 Kings
Shared: RPG · Strategy · Card Game

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

Cross Blitz
Shared: RPG · Card Game · Strategy

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

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

Super Fantasy Kingdom
Shared: RPG · Strategy · Card Game

Griftlands
Shared: RPG · Card Battler · Roguelite

Roguebook
Shared: RPG · Card Game · Strategy

For The King II
Shared: RPG · Strategy · Party-Based RPG

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

Mewgenics
Shared: RPG · Turn-Based Strategy · Roguelite

Morimens
Shared: Card Battler · Card Game · Party-Based RPG

Gordian Quest
Shared: RPG · Strategy · Card Game

Chrono Ark
Shared: RPG · Strategy · Card Game

The Last Spell
Shared: Strategy · RPG · Turn-Based Strategy

Balatro
Shared: Card Game · Strategy · Roguelite

SteamWorld Quest: Hand of Gilgamech
Shared: RPG · Card Game · Card Battler

Wartales
Shared: RPG · Party-Based RPG · Turn-Based Strategy

Inscryption
Shared: Card Game · Card Battler · Strategy

Demeo
Shared: RPG · Strategy · Turn-Based Strategy

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

NEOVERSE
Shared: Card Battler · Turn-Based Strategy · Card Game