Games like Nightfall
Games like Nightfall include Skul: The Hero Slayer, The Binding of Isaac, Vampire Survivors, Rogue Legacy, and The Binding of Isaac: Rebirth. We matched them by the tags players give Nightfall on Steam (Action Roguelike, Action, PvE, Roguelike, and 2D): closest matches first, and among equally close ones the better-known games.

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

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

Vampire Survivors
Shared: Action Roguelike · 2D · Roguelike

Rogue Legacy
Shared: Action Roguelike · Roguelike · Action

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

Halls of Torment
Shared: Action Roguelike · Roguelike · Action

Hades
Shared: Action Roguelike · Action · Roguelike

Sephiria
Shared: Action Roguelike · Roguelike · Action

Megabonk
Shared: Action Roguelike · Roguelike · Action

Dead Cells
Shared: Action Roguelike · Roguelike · 2D

暖雪 Warm Snow
Shared: Action Roguelike · Roguelike · 2D

Enter the Gungeon
Shared: Action Roguelike · Roguelike · Indie

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

Risk of Rain Returns
Shared: Action Roguelike · PvE · 2D

BALL x PIT
Shared: Action · Action Roguelike · Roguelike

Shape of Dreams
Shared: Action Roguelike · PvE · Action

Nuclear Throne
Shared: Action Roguelike · Roguelike · Action

Dungreed
Shared: Action Roguelike · Roguelike · Action

Ravenswatch
Shared: Action Roguelike · Roguelike · Action

Hades II
Shared: Action · Roguelike · Action Roguelike

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

Brotato
Shared: Action Roguelike · Roguelike · Singleplayer

Death Must Die
Shared: Action Roguelike · Action · 2D

Hero Siege
Shared: Action Roguelike · Roguelike · Action