Games like HackyZack
Games like HackyZack include LIMBO, Defy Gravity Extended, Hollow Knight, Portal 2, and Out There Somewhere. We matched them by the tags players give HackyZack on Steam (Indie, Sports, Action, Platformer, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

LIMBO
Shared: Indie · Puzzle Platformer · Platformer

Defy Gravity Extended
Shared: Indie · Platformer · Puzzle Platformer

Hollow Knight
Shared: Platformer · Indie · Difficult

Portal 2
Shared: Platformer · Puzzle · Puzzle Platformer

Out There Somewhere
Shared: Indie · Platformer · Puzzle

EDGE
Shared: Indie · Puzzle Platformer · Action

Planet of Lana
Shared: Action · Puzzle Platformer · Puzzle

Braid
Shared: Indie · Puzzle Platformer · Puzzle

Celeste
Shared: Indie · Difficult · Platformer

Hollow Knight: Silksong
Shared: Indie · Difficult · Platformer

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

Seen
Shared: Indie · Puzzle · Platformer

Teslagrad
Shared: Indie · Platformer · Puzzle

Squishy the Suicidal Pig
Shared: Indie · Platformer · Puzzle Platformer

Cuphead
Shared: Platformer · Difficult · Indie

Toki Tori
Shared: Indie · Puzzle · Platformer

Nihilumbra
Shared: Indie · Platformer · Puzzle

BADLAND: Game of the Year Edition
Shared: Indie · Action · Platformer

MO:Astray
Shared: Indie · Action · Puzzle Platformer

Oddworld: New 'n' Tasty
Shared: Platformer · Puzzle Platformer · Indie

DeadCore
Shared: Indie · Action · Platformer

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

Nine Sols
Shared: Platformer · Action · Difficult

Katana ZERO
Shared: Action · Platformer · Indie