Games like Pour Boy and the Nitro Necromancer
Games like Pour Boy and the Nitro Necromancer include Well Dweller, SANABI, Mina the Hollower, Anomaly Agent, and Hollow Knight. We matched them by the tags players give Pour Boy and the Nitro Necromancer on Steam (Adventure, Action-Adventure, Platformer, 2D Platformer, and Collectathon): closest matches first, and among equally close ones the better-known games.

Well Dweller
Shared: Action-Adventure · Adventure · Platformer

SANABI
Shared: Adventure · 2D Platformer · Action-Adventure

Mina the Hollower
Shared: Action-Adventure · 2D Platformer · Platformer

Anomaly Agent
Shared: 2D Platformer · Platformer · Side Scroller

Hollow Knight
Shared: Platformer · 2D · Adventure

Sonic Superstars
Shared: Platformer · Adventure · 2D Platformer

Thank Goodness You're Here!
Shared: Adventure · 2D Platformer · Hand-drawn

Blasphemous 2
Shared: Adventure · 2D Platformer · Side Scroller

Cuphead
Shared: Platformer · Cartoon · 2D

Trine 5: A Clockwork Conspiracy
Shared: Adventure · Platformer · Action-Adventure

Deadlight
Shared: Platformer · Adventure · Side Scroller

Gal Guardians: Demon Purge
Shared: Adventure · 2D Platformer · Platformer

Mark of the Ninja
Shared: Platformer · Adventure · 2D

Nine Sols
Shared: Platformer · 2D · Adventure

Creepy Tale
Shared: Adventure · 2D Platformer · Platformer

Legacy of Kain: Ascendance
Shared: Adventure · Action-Adventure · Platformer

Constance
Shared: Platformer · Action-Adventure · 2D

Blasphemous
Shared: 2D · Dark Fantasy · Platformer

Wonder Boy: The Dragon's Trap
Shared: Adventure · Platformer · 2D

LIMBO
Shared: Platformer · Adventure · 2D

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

Shiro
Shared: Adventure · Platformer · Action-Adventure

8Doors: Arum's Afterlife Adventure
Shared: Adventure · Platformer · Action-Adventure

Monster Boy and the Cursed Kingdom
Shared: Adventure · Platformer · 2D