Games like Katanaut
Games like Katanaut include Hades, Dead Cells, Skul: The Hero Slayer, Hades II, and The Binding of Isaac: Rebirth. We matched them by the tags players give Katanaut on Steam (Action, Action Roguelike, Roguelike, Hack and Slash, and Fast-Paced): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Hack and Slash · Action

Dead Cells
Shared: Roguelike · Action Roguelike · Roguelite

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

Hades II
Shared: Action · Roguelike · Hack and Slash

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

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

Ravenswatch
Shared: Roguelike · Action Roguelike · Action

Risk of Rain (2013)
Shared: Action Roguelike · Roguelike · Action

Dungreed
Shared: Action Roguelike · Roguelike · Action

Vampire Survivors
Shared: Action Roguelike · Roguelite · Roguelike

Megabonk
Shared: Action Roguelike · Roguelike · Roguelite

Wizard of Legend
Shared: Action Roguelike · Roguelike · Action

Rogue Legacy
Shared: Roguelike · Action Roguelike · Action

Death Must Die
Shared: Action Roguelike · Roguelite · Action

Halls of Torment
Shared: Action Roguelike · Roguelite · Roguelike

Hero Siege
Shared: Action Roguelike · Hack and Slash · Roguelike

Moonlighter
Shared: Hack and Slash · Roguelike · Action Roguelike

BlazBlue Entropy Effect
Shared: Action Roguelike · Action · Hack and Slash

Nuclear Throne
Shared: Action Roguelike · Roguelike · Action

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

Streets of Rogue
Shared: Action Roguelike · Roguelite · Action

Spelunky
Shared: Action Roguelike · Roguelike · Difficult

Gunfire Reborn
Shared: Roguelike · Roguelite · Action

NECROPOLIS: BRUTAL EDITION
Shared: Action Roguelike · Action · Roguelike