Games like Nux
Games like Nux include Skul: The Hero Slayer, Katana ZERO, Dust: An Elysian Tail, Broforce, and Rogue Legacy. We matched them by the tags players give Nux on Steam (Action, Platformer, Shoot 'Em Up, and Indie): closest matches first, and among equally close ones the better-known games.

Skul: The Hero Slayer
Shared: Action · Indie · Platformer

Katana ZERO
Shared: Action · Platformer · Indie

Dust: An Elysian Tail
Shared: Action · Platformer · Indie

Broforce
Shared: Action · Platformer · Indie

Rogue Legacy
Shared: Platformer · Action · Indie

Cuphead
Shared: Platformer · Indie · Action

Hollow Knight
Shared: Platformer · Indie · Action

Risk of Rain (2013)
Shared: Platformer · Action · Indie

Intrusion 2
Shared: Action · Platformer · Indie

Deadlight
Shared: Platformer · Action · Indie

My Friend Pedro
Shared: Action · Indie · Platformer

Rogue Legacy 2
Shared: Platformer · Action · Indie

BEEP
Shared: Platformer · Indie · Action

Zombotron
Shared: Action · Indie · Platformer

Mark of the Ninja
Shared: Platformer · Action · Indie

Guns, Gore & Cannoli
Shared: Action · Shoot 'Em Up · Indie

Valfaris
Shared: Action · Platformer · Indie

Shovel Knight: Treasure Trove
Shared: Platformer · Indie · Action

Ori and the Will of the Wisps
Shared: Platformer · Action · Indie

Savant - Ascent
Shared: Action · Indie · Shoot 'Em Up

BlazBlue Entropy Effect
Shared: Action · Platformer · Indie

Bleed
Shared: Action · Platformer · Indie

Nine Sols
Shared: Platformer · Action · Indie

FISH
Shared: Action · Platformer · Shoot 'Em Up