Games like Harold
Games like Harold include SpeedRunners, LIMBO, Defy Gravity Extended, MO:Astray, and Skul: The Hero Slayer. We matched them by the tags players give Harold on Steam (Action, Indie, Racing, Platformer, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

SpeedRunners
Shared: Racing · Indie · Action

LIMBO
Shared: Indie · Puzzle Platformer · Platformer

Defy Gravity Extended
Shared: Indie · Platformer · Puzzle Platformer

MO:Astray
Shared: Action · Indie · Puzzle Platformer

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

Planet of Lana
Shared: Action · Puzzle Platformer · Platformer

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

Katana ZERO
Shared: Action · Platformer · Indie

Broforce
Shared: Action · Platformer · Indie

Rogue Legacy
Shared: Indie · Platformer · Action

EDGE
Shared: Indie · Action · Puzzle Platformer

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

My Friend Pedro
Shared: Action · Indie · Platformer

Retrowave
Shared: Racing · Indie · Action

Hollow Knight
Shared: Platformer · Indie · Action

Out There Somewhere
Shared: Indie · Platformer · Action

Seen
Shared: Indie · Action · Platformer

Deadlight
Shared: Action · Indie · Platformer

Iconoclasts
Shared: Indie · Action · Platformer

Portal 2
Shared: Platformer · Puzzle Platformer · Action

Rogue Legacy 2
Shared: Action · Platformer · Indie

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

GRIP: Combat Racing
Shared: Action · Racing · Indie

Mark of the Ninja
Shared: Indie · Platformer · Action