Games like Boingo!
Games like Boingo! include Celeste, SANABI, Super Meat Boy, Webbed, and VVVVVV. We matched them by the tags players give Boingo! on Steam (2D Platformer, Precision Platformer, Collectathon, Pixel Graphics, and Colorful): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · Pixel Graphics · 2D Platformer

SANABI
Shared: Pixel Graphics · 2D Platformer · Action

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

Webbed
Shared: 2D Platformer · Pixel Graphics · Cute

VVVVVV
Shared: Precision Platformer · Pixel Graphics · 2D Platformer

Lone Fungus
Shared: 2D Platformer · Pixel Graphics · Colorful

Pizza Tower
Shared: 2D Platformer · Pixel Graphics · Platformer

Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Pixel Graphics · Side Scroller

Downwell
Shared: Precision Platformer · Pixel Graphics · 2D Platformer

Sonic Origins
Shared: 2D Platformer · Pixel Graphics · Action

Bread & Fred
Shared: 2D Platformer · Pixel Graphics · Cute

Sonic Mania
Shared: Pixel Graphics · Platformer · Colorful

Katana ZERO
Shared: Pixel Graphics · 2D Platformer · Action

A Hat in Time
Shared: Collectathon · Cute · Colorful

Jump King
Shared: Precision Platformer · Pixel Graphics · Platformer

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

Windswept
Shared: 2D Platformer · Precision Platformer · Pixel Graphics

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

NINJA GAIDEN: Ragebound
Shared: 2D Platformer · Pixel Graphics · Action

Ambidextro
Shared: Precision Platformer · 2D Platformer · Pixel Graphics

Broforce
Shared: Pixel Graphics · Action · Platformer

The Messenger
Shared: Pixel Graphics · Platformer · 2D Platformer

Yooka-Laylee
Shared: Collectathon · Colorful · Platformer

Garbanzo Quest
Shared: 2D Platformer · Pixel Graphics · Precision Platformer