Games like Restless Hero
Games like Restless Hero include Hollow Knight, Celeste, Hollow Knight: Silksong, Katana ZERO, and Hotline Miami. We matched them by the tags players give Restless Hero on Steam (Indie, Action, Adventure, Violent, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Platformer · Indie · Great Soundtrack

Celeste
Shared: Indie · Pixel Graphics · Platformer

Hollow Knight: Silksong
Shared: Indie · Great Soundtrack · Difficult

Katana ZERO
Shared: Action · Pixel Graphics · Indie

Hotline Miami
Shared: Action · Indie · Violent

SANABI
Shared: Action · Pixel Graphics · Adventure

Shovel Knight: Treasure Trove
Shared: Indie · Pixel Graphics · Platformer

Hyper Light Drifter
Shared: Indie · Pixel Graphics · Adventure

Rain World
Shared: Indie · Survival · Pixel Graphics

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

Hotline Miami 2: Wrong Number
Shared: Action · Violent · Pixel Graphics

Blasphemous
Shared: Pixel Graphics · Indie · Violent

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

Terraria
Shared: Adventure · Survival · Pixel Graphics

Titan Souls
Shared: Indie · Pixel Graphics · Adventure

MO:Astray
Shared: Indie · Action · Adventure

Out There Somewhere
Shared: Indie · Pixel Graphics · Platformer

Axiom Verge
Shared: Indie · Pixel Graphics · Action

The Escapists
Shared: Pixel Graphics · Indie · Action

CARRION
Shared: Action · Pixel Graphics · Indie

Jump King
Shared: Indie · Adventure · Pixel Graphics

Pizza Tower
Shared: Indie · Great Soundtrack · Platformer

Super Meat Boy
Shared: Indie · Platformer · Pixel Graphics

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