Games like Slay The Abyss
Games like Slay The Abyss include Slay the Spire, Inscryption, Slay the Spire 2, Balatro, and Ratropolis. We matched them by the tags players give Slay The Abyss on Steam (Deckbuilding, Roguelike, Real Time Tactics, Card Battler, and Strategy): closest matches first, and among equally close ones the better-known games.

Slay the Spire
Shared: Roguelike · Deckbuilding · Card Battler

Inscryption
Shared: Deckbuilding · Card Battler · Card Game

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

Balatro
Shared: Roguelike · Deckbuilding · Card Game

Ratropolis
Shared: Deckbuilding · Card Battler · Strategy

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

9 Kings
Shared: Roguelike · Strategy · Deckbuilding

Monster Train
Shared: Deckbuilding · Card Battler · Roguelike

Dicey Dungeons
Shared: Deckbuilding · Card Battler · Roguelike

Griftlands
Shared: Deckbuilding · Card Battler · Roguelite

Dungeons & Degenerate Gamblers
Shared: Roguelike · Deckbuilding · Strategy

Die in the Dungeon
Shared: Roguelike · Deckbuilding · Strategy

Loop Hero
Shared: Roguelike · Deckbuilding · Roguelite

Menace from the Deep
Shared: Deckbuilding · Roguelike · Card Battler

DICEOMANCER
Shared: Strategy · Card Battler · Deckbuilding

天外武林 (Traveler of Wuxia)
Shared: Deckbuilding · Roguelike · Card Battler

Stacklands
Shared: Card Game · Card Battler · Strategy

Super Fantasy Kingdom
Shared: Roguelike · Strategy · Deckbuilding

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

Wildfrost
Shared: Card Battler · Deckbuilding · Card Game

Aces & Adventures
Shared: Deckbuilding · Strategy · Card Game

Knock on the Coffin Lid
Shared: Roguelike · Deckbuilding · Card Battler

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

Roguebook
Shared: Deckbuilding · Card Game · Strategy