Games like Contra Anniversary Collection
Games like Contra Anniversary Collection include METAL SLUG 3, Broforce, METAL SLUG, METAL SLUG X, and Sonic Mania. We matched them by the tags players give Contra Anniversary Collection on Steam (Action, Side Scroller, Retro, 2D, and Classic): closest matches first, and among equally close ones the better-known games.

METAL SLUG 3
Shared: Action · Side Scroller · Classic

Broforce
Shared: Action · 2D · Platformer

METAL SLUG
Shared: Action · Side Scroller · 2D

METAL SLUG X
Shared: Action · 2D · Classic

Sonic Mania
Shared: 2D · Retro · Platformer

Huntdown
Shared: Side Scroller · Action · Shooter

Cuphead
Shared: Difficult · Platformer · 2D

METAL SLUG 2
Shared: Action · Side Scroller · 2D

Shovel Knight: Treasure Trove
Shared: Retro · Platformer · Action

Blazing Chrome
Shared: Action · Retro · Side Scroller

METAL SLUG XX
Shared: Action · Retro · 2D

Bloodstained: Curse of the Moon
Shared: Action · Retro · 2D

Mega Man 11
Shared: Action · Side Scroller · Platformer

SANABI
Shared: Action · 2D · Pixel Graphics

Kero Blaster
Shared: Side Scroller · Platformer · Shooter

Guns, Gore and Cannoli 2
Shared: Action · Side Scroller · 2D

Bloodstained: Curse of the Moon 2
Shared: Action · Retro · 2D

Contra: Operation Galuga
Shared: Action · Side Scroller · Platformer

The Messenger
Shared: Retro · Platformer · 2D

Guns, Gore & Cannoli
Shared: Action · Side Scroller · 2D

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

Super Meat Boy
Shared: Platformer · 2D · Difficult

Commander Keen
Shared: Classic · Action · Platformer

Geometry Dash
Shared: 2D · Difficult · Platformer