Games like Slay the Dragon!
Games like Slay the Dragon! include Wolcen: Lords of Mayhem, Bastion, Last Epoch, Where Winds Meet, and Stellar Blade™. We matched them by the tags players give Slay the Dragon! on Steam (Fantasy, Action, Casual, Hack and Slash, and Isometric): closest matches first, and among equally close ones the better-known games.

Wolcen: Lords of Mayhem
Shared: Hack and Slash · Isometric · Action

Bastion
Shared: Action · Hack and Slash · Singleplayer

Last Epoch
Shared: Hack and Slash · Isometric · Action

Where Winds Meet
Shared: Singleplayer · Free to Play · Fantasy

Stellar Blade™
Shared: Action · Hack and Slash · Singleplayer

Darksiders III
Shared: Action · Hack and Slash · Singleplayer

God of War
Shared: Action · Singleplayer · Hack and Slash

Hades
Shared: Hack and Slash · Action · Indie

Black Myth: Wukong
Shared: Action · Singleplayer · Action-Adventure

Crimson Desert Enhanced
Shared: Action · Singleplayer · Fantasy

Grim Dawn
Shared: Hack and Slash · Isometric · Singleplayer

God of War Ragnarök
Shared: Action · Hack and Slash · Action-Adventure

ICEY
Shared: Action · Hack and Slash · Singleplayer

Darksiders™
Shared: Action · Hack and Slash · Fantasy

Middle-earth™: Shadow of Mordor™
Shared: Action · Fantasy · Singleplayer

Book of Demons
Shared: Hack and Slash · Singleplayer · Isometric

Idle Champions of the Forgotten Realms
Shared: Fantasy · Singleplayer · Free to Play

Bayonetta
Shared: Action · Hack and Slash · Singleplayer

Middle-earth: Shadow of War
Shared: Action · Fantasy · Singleplayer

Hades II
Shared: Action · Hack and Slash · Isometric

Path of Exile
Shared: Hack and Slash · Free to Play · Isometric

Rise of the Tomb Raider™
Shared: Action · Singleplayer · Action-Adventure

Diablo® IV
Shared: Hack and Slash · Isometric · Singleplayer

Bright Memory: Infinite
Shared: Action · Singleplayer · Indie