Games like J and the Sewer World
Games like J and the Sewer World include SANABI, Celeste, Hollow Knight, Rain World, and Owlboy. We matched them by the tags players give J and the Sewer World on Steam (Adventure, Action-Adventure, Platformer, Exploration, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Adventure · Pixel Graphics · 2D Platformer

Celeste
Shared: Platformer · Pixel Graphics · 2D Platformer

Hollow Knight
Shared: Platformer · 2D · Exploration

Rain World
Shared: Exploration · Platformer · Pixel Graphics

Owlboy
Shared: Adventure · Platformer · Pixel Graphics

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

Hollow Knight: Silksong
Shared: Platformer · 2D · Exploration

Terraria
Shared: Adventure · 2D · Pixel Graphics

Webbed
Shared: 2D Platformer · Exploration · Pixel Graphics

FEZ
Shared: Platformer · Exploration · Adventure

Reventure
Shared: Adventure · Platformer · Pixel Graphics

Five Nights at Freddy's: Into the Pit
Shared: Adventure · Pixel Graphics · Exploration

VVVVVV
Shared: Platformer · Pixel Graphics · 2D Platformer

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

MIO: Memories in Orbit
Shared: Platformer · Exploration · Action-Adventure

Narita Boy
Shared: Adventure · Platformer · 2D

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

Mina the Hollower
Shared: Action-Adventure · Platformer · Pixel Graphics

Pipistrello and the Cursed Yoyo
Shared: Action-Adventure · Exploration · Pixel Graphics

Super Meat Boy
Shared: Platformer · 2D Platformer · 2D

BlazBlue Entropy Effect
Shared: Action-Adventure · Platformer · 2D

ANIMAL WELL
Shared: Exploration · Platformer · Pixel Graphics

Skul: The Hero Slayer
Shared: Pixel Graphics · 2D · Indie

Dead Cells
Shared: Adventure · 2D · Pixel Graphics