Dust: AET has 12 unlockable “friends” that give you a health boost with each one you find.  But more importantly, they provide you with a warm fuzzy feeling if you have played any or all of the games that starred this lovable cast.

Featured in the game and subsequent video are:

Meat Boy

Bandage Girl

The Dishwasher

Yuki

Chris (HyperDuck SoundWorks)

Dan (HyperDuck SoundWorks)

Spelunky

Spelunky’s Girl

Tim from Braid

The Kid from Bastion

The Maw

Gomez from Fez

 

Until you find them all yourself, enjoy the collection here.

If you are looking for help getting all of the friends unlocked, cakechieveables has a great tutorial right here: