Games like Smash Dungeon
Games like Smash Dungeon include Hades, Hades II, Hero Siege, Heroes of Hammerwatch II, and Moonlighter. We matched them by the tags players give Smash Dungeon on Steam (Action Roguelike, Hack and Slash, Dungeon Crawler, Procedural Generation, and Top-Down): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Hack and Slash · Indie

Hades II
Shared: Hack and Slash · Action Roguelike · Roguelike

Hero Siege
Shared: Hack and Slash · Action Roguelike · Co-op

Heroes of Hammerwatch II
Shared: Action Roguelike · Dungeon Crawler · Roguelike

Moonlighter
Shared: Hack and Slash · Dungeon Crawler · Action Roguelike

Halls of Torment
Shared: Action Roguelike · Dark Fantasy · Roguelike

Shape of Dreams
Shared: Action Roguelike · Hack and Slash · Co-op

Cinderia
Shared: Action Roguelike · Hack and Slash · Dungeon Crawler

Mortal Sin
Shared: Action Roguelike · Dungeon Crawler · Hack and Slash

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Dungeon Crawler · Roguelike

Grim Dawn
Shared: Hack and Slash · Dungeon Crawler · Dark Fantasy

Children of Morta
Shared: Hack and Slash · Action Roguelike · Roguelike

Heroes of Hammerwatch
Shared: Action Roguelike · Co-op · Dungeon Crawler

Last Epoch
Shared: Hack and Slash · Top-Down · Dungeon Crawler

The Binding of Isaac
Shared: Action Roguelike · Procedural Generation · Roguelike

Ravenswatch
Shared: Action Roguelike · Co-op · Roguelike

Path of Exile
Shared: Hack and Slash · Dark Fantasy · Dungeon Crawler

Enter the Gungeon
Shared: Action Roguelike · Dungeon Crawler · Roguelike

Wizard of Legend
Shared: Action Roguelike · Dungeon Crawler · Roguelike

SWORN
Shared: Action Roguelike · Hack and Slash · Co-op

Ember Knights
Shared: Action Roguelike · Co-op · Dungeon Crawler

Death Must Die
Shared: Action Roguelike · Hack and Slash · Roguelite

Soulstone Survivors
Shared: Action Roguelike · Hack and Slash · Roguelike

Lost Castle
Shared: Action Roguelike · Dungeon Crawler · Hack and Slash