Games like Manda Duo
Games like Manda Duo include Broforce, Celeste, Duck Game, Bread & Fred, and Door Kickers: Action Squad. We matched them by the tags players give Manda Duo on Steam (Local Co-Op, Retro, Indie, Cute, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

Broforce
Shared: Local Co-Op · Pixel Graphics · Indie

Celeste
Shared: Indie · Pixel Graphics · Platformer

Duck Game
Shared: Pixel Graphics · Local Multiplayer · Indie

Bread & Fred
Shared: Local Co-Op · Cute · Pixel Graphics

Door Kickers: Action Squad
Shared: Local Co-Op · Retro · Pixel Graphics

PICO PARK
Shared: Local Co-Op · Cute · Platformer

Super Meat Boy
Shared: Indie · Platformer · Pixel Graphics

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

Cuphead
Shared: Local Co-Op · Platformer · Indie

TowerFall Ascension
Shared: Indie · Local Co-Op · Local Multiplayer

Huntdown
Shared: Local Co-Op · Pixel Graphics · Retro

VVVVVV
Shared: Pixel Graphics · Indie · Platformer

UFO 50
Shared: Indie · Retro · Pixel Graphics

Spelunky 2
Shared: Platformer · Indie · Local Co-Op

Downwell
Shared: Indie · Pixel Graphics · Platformer

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

Spelunky
Shared: Indie · Platformer · Local Co-Op

The Messenger
Shared: Retro · Platformer · Pixel Graphics

Dead Pixels
Shared: Local Co-Op · Indie · Pixel Graphics

Jump King
Shared: Indie · Pixel Graphics · Platformer

Garbanzo Quest
Shared: Indie · Pixel Graphics · Local Co-Op

Rivals of Aether
Shared: Indie · Pixel Graphics · Local Multiplayer

Never Alone (Kisima Ingitchuna)
Shared: Local Co-Op · Indie · Platformer

Ultimate Chicken Horse
Shared: Local Co-Op · Platformer · Local Multiplayer

