Games like Will Glow the Wisp
Games like Will Glow the Wisp include Geometry Dash, Cuphead, Touhou Luna Nights, Rogue Legacy 2, and Vampire Survivors. We matched them by the tags players give Will Glow the Wisp on Steam (Side Scroller, Bullet Hell, Flight, Difficult, and Platformer): closest matches first, and among equally close ones the better-known games.

Geometry Dash
Shared: Difficult · 2D · Platformer

Cuphead
Shared: Difficult · Platformer · 2D

Touhou Luna Nights
Shared: Side Scroller · Bullet Hell · Difficult

Rogue Legacy 2
Shared: Arcade · Platformer · Difficult

Vampire Survivors
Shared: Bullet Hell · 2D · Arcade

Bit Blaster XL
Shared: Bullet Hell · Difficult · Arcade

Hollow Knight
Shared: Platformer · Difficult · 2D

Orbt XL
Shared: Difficult · Arcade · 2D

Shovel Knight: Treasure Trove
Shared: Platformer · 2D · Difficult

A Dance of Fire and Ice
Shared: Difficult · 2D · Arcade

LUFTRAUSERS
Shared: Bullet Hell · Arcade · 2D

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

Skul: The Hero Slayer
Shared: 2D · Platformer · Action

LIMBO
Shared: Platformer · 2D · Side Scroller

Broforce
Shared: Platformer · 2D · Side Scroller

Super Hexagon
Shared: Difficult · Arcade · Indie

Volgarr the Viking
Shared: Difficult · Platformer · 2D

Spelunky
Shared: Platformer · Difficult · 2D

BEHEMOTH
Shared: Side Scroller · Bullet Hell · Arcade

Super Meat Boy
Shared: Difficult · Platformer · 2D

pureya
Shared: Arcade · Side Scroller · 2D

Giana Sisters: Twisted Dreams
Shared: Side Scroller · Difficult · Platformer

Superflight
Shared: Flight · Relaxing · Casual

Exit the Gungeon
Shared: Bullet Hell · Arcade · Difficult