Games like WiP
Games like WiP include Gravity Circuit, Broforce, Super Meat Boy, SANABI, and Katana ZERO. We matched them by the tags players give WiP on Steam (Side Scroller, 2D Platformer, Beat 'em up, Shooter, and Platformer): closest matches first, and among equally close ones the better-known games.

Gravity Circuit
Shared: Platformer · 2D Platformer · Action

Broforce
Shared: Platformer · 2D · Side Scroller

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

SANABI
Shared: 2D Platformer · Pixel Graphics · Action

Katana ZERO
Shared: 2D Platformer · Platformer · Action

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

Nitro Express
Shared: Side Scroller · 2D Platformer · Beat 'em up

Huntdown
Shared: Side Scroller · Shooter · Pixel Graphics

Shank
Shared: Beat 'em up · Side Scroller · Platformer

Shank 2
Shared: Beat 'em up · Side Scroller · 2D

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

Celeste
Shared: 2D Platformer · Platformer · Pixel Graphics

Terminator 2D: NO FATE
Shared: Side Scroller · 2D Platformer · Shooter

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

30XX
Shared: 2D Platformer · Side Scroller · Platformer

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

NINJA GAIDEN: Ragebound
Shared: 2D Platformer · Side Scroller · Platformer

Iron Meat
Shared: Side Scroller · 2D Platformer · Shooter

My Friend Pedro
Shared: Shooter · Side Scroller · Action

Smilemo
Shared: 2D Platformer · Platformer · Side Scroller

Thomas Was Alone
Shared: Side Scroller · 2D Platformer · Platformer

Rogue Legacy
Shared: Platformer · 2D · Side Scroller

Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: Beat 'em up · Side Scroller · 2D

Intrusion 2
Shared: Platformer · Shooter · Side Scroller