Games like Neon Ascent
Games like Neon Ascent include Slay the Spire, Balatro, Slay the Spire 2, 9 Kings, and Monster Train. We matched them by the tags players give Neon Ascent on Steam (Roguelike Deckbuilder, Deckbuilding, Strategy, RPG, and Card Battler): closest matches first, and among equally close ones the better-known games.

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

Balatro
Shared: Roguelike Deckbuilder · Deckbuilding · Strategy

Slay the Spire 2
Shared: Deckbuilding · Roguelike Deckbuilder · Strategy

9 Kings
Shared: Strategy · RPG · Deckbuilding

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

Dicey Dungeons
Shared: Roguelike Deckbuilder · Deckbuilding · Card Battler

Roguebook
Shared: RPG · Deckbuilding · Strategy

Dungeons & Degenerate Gamblers
Shared: Roguelike Deckbuilder · Strategy · Deckbuilding

Wildfrost
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding

Super Fantasy Kingdom
Shared: Strategy · RPG · Roguelike

Chrono Ark
Shared: Roguelike Deckbuilder · Strategy · RPG

Die in the Dungeon
Shared: Deckbuilding · Strategy · Roguelike Deckbuilder

Griftlands
Shared: Deckbuilding · Card Battler · RPG

Inscryption
Shared: Deckbuilding · Card Battler · Card Game

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

Overdungeon
Shared: Roguelike Deckbuilder · Strategy · RPG

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

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

Gordian Quest
Shared: RPG · Strategy · Card Battler

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

DICEOMANCER
Shared: Strategy · Roguelike Deckbuilder · Card Battler

Hand of Fate
Shared: Roguelike Deckbuilder · Deckbuilding · Roguelike

Deep Sky Derelicts
Shared: Roguelike Deckbuilder · Strategy · RPG

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