Games like Black Paradox
Games like Black Paradox include Vampire Survivors, Broforce, Skul: The Hero Slayer, Streets of Rogue, and Enter the Gungeon. We matched them by the tags players give Black Paradox on Steam (Action, Shoot 'Em Up, Roguelite, Pixel Graphics, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Roguelite · Pixel Graphics · Action Roguelike

Broforce
Shared: Action · Pixel Graphics · Co-op

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · Roguelite

Streets of Rogue
Shared: Roguelite · Pixel Graphics · Action

Enter the Gungeon
Shared: Pixel Graphics · Action Roguelike · Action

Nuclear Throne
Shared: Pixel Graphics · Action · Action Roguelike

BALL x PIT
Shared: Action · Roguelite · Shoot 'Em Up

Risk of Rain 2
Shared: Action · Co-op · Roguelite

Huntdown
Shared: Action · Pixel Graphics · Shoot 'Em Up

Dungreed
Shared: Pixel Graphics · Action · Roguelite

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Pixel Graphics · 2D

Death Must Die
Shared: Roguelite · Pixel Graphics · Action

Sephiria
Shared: Roguelite · Action · Co-op

Star of Providence
Shared: Roguelite · Shoot 'Em Up · Action

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

Wizard of Legend
Shared: Pixel Graphics · Action · Action Roguelike

Halls of Torment
Shared: Roguelite · Pixel Graphics · Action

Heroes of Hammerwatch
Shared: Roguelite · Pixel Graphics · Co-op

Hero Siege
Shared: Pixel Graphics · Co-op · Action Roguelike

Nova Drift
Shared: Shoot 'Em Up · Roguelite · Action Roguelike

Hades
Shared: Roguelite · Action · Action Roguelike

METAL SLUG X
Shared: Action · Co-op · Shoot 'Em Up

Cuphead
Shared: Co-op · 2D · Local Co-Op

METAL SLUG
Shared: Action · Shoot 'Em Up · 2D