Games like NBB.EXE
Games like NBB.EXE include Celeste, Hollow Knight, TUNIC, Hollow Knight: Silksong, and Nine Sols. We matched them by the tags players give NBB.EXE on Steam (Top-Down, Difficult, Precision Platformer, Puzzle Platformer, and Action-Adventure): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Difficult · Precision Platformer · Platformer

Hollow Knight
Shared: Difficult · Metroidvania · Platformer

TUNIC
Shared: Difficult · Action-Adventure · Metroidvania

Hollow Knight: Silksong
Shared: Difficult · Metroidvania · Platformer

Nine Sols
Shared: Difficult · Metroidvania · Action

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

Portal 2
Shared: Puzzle Platformer · Platformer · Puzzle

I wanna be the Creator
Shared: Action · Action-Adventure · Difficult

Geometry Dash
Shared: Difficult · Precision Platformer · Platformer

ANIMAL WELL
Shared: Metroidvania · Puzzle Platformer · Puzzle

LIMBO
Shared: Puzzle Platformer · Platformer · Puzzle

Defy Gravity Extended
Shared: Puzzle Platformer · Difficult · Platformer

La-Mulana 2
Shared: Difficult · Action-Adventure · Puzzle Platformer

Aeterna Noctis
Shared: Difficult · Precision Platformer · Metroidvania

MIO: Memories in Orbit
Shared: Metroidvania · Difficult · Action-Adventure

Tomb Raider IV-VI Remastered
Shared: Action · Action-Adventure · Precision Platformer

Super Meat Boy
Shared: Precision Platformer · Difficult · Platformer

Jump King
Shared: Difficult · Precision Platformer · Action

La-Mulana
Shared: Difficult · Metroidvania · Platformer

Leap Year
Shared: Precision Platformer · Puzzle Platformer · Metroidvania

Prince of Persia The Lost Crown
Shared: Metroidvania · Action · Precision Platformer

Crash Bandicoot™ 4: It’s About Time
Shared: Difficult · Action · Action-Adventure

STAR WARS Jedi: Fallen Order™
Shared: Action-Adventure · Action · Sci-fi

Touhou Luna Nights
Shared: Difficult · Metroidvania · Action-Adventure