Games like The Wizard and The Slug
Games like The Wizard and The Slug include Celeste, Super Meat Boy, SANABI, Momodora: Reverie Under The Moonlight, and Afterimage. We matched them by the tags players give The Wizard and The Slug on Steam (Precision Platformer, Side Scroller, Strategy, 2D Platformer, and Multiple Endings): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · 2D Platformer · Platformer

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

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

Momodora: Reverie Under The Moonlight
Shared: Side Scroller · 2D Platformer · Female Protagonist

Afterimage
Shared: 2D Platformer · Side Scroller · Female Protagonist

Thomas Was Alone
Shared: Side Scroller · Precision Platformer · Platformer

Bō: Path of the Teal Lotus
Shared: Precision Platformer · Side Scroller · 2D Platformer

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

Prince of Persia The Lost Crown
Shared: 2D Platformer · Side Scroller · Precision Platformer

Geometry Dash
Shared: Precision Platformer · 2D · Platformer

Touhou Hero of Ice Fairy
Shared: Side Scroller · Female Protagonist · Platformer

ICEY
Shared: Side Scroller · Female Protagonist · Action

Tribal Hunter
Shared: 2D Platformer · Platformer · Action-Adventure

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

Hollow Knight
Shared: Platformer · 2D · Multiple Endings

Planet of Lana
Shared: 2D Platformer · Female Protagonist · Platformer

Rabi-Ribi
Shared: Female Protagonist · Side Scroller · Action-Adventure

Pizza Tower
Shared: 2D Platformer · Platformer · Funny

Rusted Moss
Shared: Platformer · Precision Platformer · 2D Platformer

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

Shantae: Half-Genie Hero
Shared: Side Scroller · Platformer · Female Protagonist

Gal Guardians: Demon Purge
Shared: 2D Platformer · Side Scroller · Platformer

I wanna be the Creator
Shared: Platformer · Precision Platformer · Action-Adventure

Thank Goodness You're Here!
Shared: 2D Platformer · Funny · Side Scroller