Games like The Longest Dungeon
Games like The Longest Dungeon include Vampire Survivors, Halls of Torment, Rogue Legacy, The Binding of Isaac, and 暖雪 Warm Snow. We matched them by the tags players give The Longest Dungeon on Steam (Action Roguelike, Beat 'em up, 2D Fighter, RPG, and Arcade): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · 2D · Roguelike

Halls of Torment
Shared: Action Roguelike · Roguelike · RPG

Rogue Legacy
Shared: Action Roguelike · Roguelike · RPG

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Top-Down

暖雪 Warm Snow
Shared: Action Roguelike · Roguelike · RPG

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Indie

Hero Siege
Shared: Action Roguelike · RPG · Roguelike

BALL x PIT
Shared: Action Roguelike · Arcade · Roguelike

Stick It to the Stickman
Shared: Beat 'em up · 2D Fighter · Roguelike

Death Must Die
Shared: Action Roguelike · RPG · Roguelike

Streets of Rogue
Shared: Action Roguelike · RPG · Roguelike

Skul: The Hero Slayer
Shared: Action Roguelike · Roguelike · 2D

Hades
Shared: Action Roguelike · Roguelike · RPG

UnderMine
Shared: Action Roguelike · RPG · Top-Down

Sephiria
Shared: Action Roguelike · Roguelike · RPG

Heroes of Hammerwatch II
Shared: Action Roguelike · RPG · Roguelike

Enter the Gungeon
Shared: Action Roguelike · Roguelike · 2D

Spelunky
Shared: Action Roguelike · Roguelike · 2D

Dead Cells
Shared: Action Roguelike · Roguelike · 2D

Lost Castle
Shared: Action Roguelike · Beat 'em up · Roguelike

Megabonk
Shared: Action Roguelike · Roguelike · Arcade

Dungreed
Shared: Action Roguelike · Roguelike · 2D

Punch Club
Shared: Beat 'em up · RPG · 2D Fighter

Soulstone Survivors
Shared: Action Roguelike · Roguelike · RPG