Games like RAD
Games like RAD include Hades, The Binding of Isaac, The Binding of Isaac: Rebirth, Nuclear Throne, and Skul: The Hero Slayer. We matched them by the tags players give RAD on Steam (Action, Roguelite, Post-apocalyptic, Action Roguelike, and Difficult): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Roguelite · Action Roguelike · Action

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

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

Nuclear Throne
Shared: Action Roguelike · Action · Difficult

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

Risk of Rain 2
Shared: Action Roguelike · Roguelite · Action

Hades II
Shared: Action · Roguelite · Action Roguelike

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

Vampire Survivors
Shared: Roguelite · Action Roguelike · Singleplayer

Megabonk
Shared: Roguelite · Action Roguelike · Action

Curse of the Dead Gods
Shared: Action Roguelike · Roguelite · Action

Dungreed
Shared: Action Roguelike · Roguelite · Action

Ravenswatch
Shared: Action · Action Roguelike · Roguelite

SYNTHETIK: Legion Rising
Shared: Roguelite · Action · Action Roguelike

Dead Cells
Shared: Action Roguelike · Roguelite · Roguelike

Streets of Rogue
Shared: Roguelite · Action Roguelike · Action

Spelunky
Shared: Action Roguelike · Difficult · Roguelike

ScourgeBringer
Shared: Action · Roguelite · Action Roguelike

Noita
Shared: Difficult · Roguelike · Action

UnderMine
Shared: Roguelite · Action Roguelike · Action

Devil Slayer - Raksasi
Shared: Action · Action Roguelike · Difficult

GoNNER
Shared: Roguelite · Action Roguelike · Singleplayer

Dreamscaper
Shared: Roguelite · Action · Action Roguelike

Rogue Legacy
Shared: Action · Action Roguelike · Singleplayer