Games like Spiral Up
Games like Spiral Up include Broforce, Katana ZERO, SANABI, Pizza Tower, and Celeste. We matched them by the tags players give Spiral Up on Steam (Action, Platformer, 2D Platformer, 2D, and Voxel): closest matches first, and among equally close ones the better-known games.

Broforce
Shared: Action · 2D · Platformer

Katana ZERO
Shared: Action · Platformer · Pixel Graphics

SANABI
Shared: Action · Pixel Graphics · 2D Platformer

Pizza Tower
Shared: 2D Platformer · Platformer · Action

Celeste
Shared: Platformer · Pixel Graphics · 2D Platformer

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

BattleBlock Theater®
Shared: Platformer · Co-op · 2D

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

Terraria
Shared: 2D · Pixel Graphics · Multiplayer

Risk of Rain (2013)
Shared: Platformer · Action · Pixel Graphics

Gravity Circuit
Shared: Action · Platformer · 2D

BlazBlue Entropy Effect
Shared: Action · 2D · Platformer

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

Cuphead
Shared: Platformer · 2D · Co-op

Brawlhalla
Shared: 2D Platformer · Platformer · Action

Spelunky 2
Shared: Platformer · 2D Platformer · Co-op

The Messenger
Shared: Platformer · 2D · Pixel Graphics

Duck Game
Shared: Action · 2D · Pixel Graphics

VVVVVV
Shared: Platformer · Pixel Graphics · 2D Platformer

20XX
Shared: Platformer · Action · 2D Platformer

Door Kickers: Action Squad
Shared: 2D Platformer · Action · Pixel Graphics

Rogue Legacy
Shared: Platformer · Action · 2D

King Arthur's Gold
Shared: Action · 2D · Pixel Graphics

Awesomenauts
Shared: Platformer · Action · 2D