Available by way of update
Holiday season or not, we appreciate getting freebies. Black Forest Games has put out a free Christmas-themed level for Giana Sisters: Twisted Dreams that owners of the game can grab from the Extras menu as of today.
In addition to offering this content via update across Steam, GOG.com, GamersGate, and backer versions of Twisted Dreams, the level itself will be a standalone download on both Steam and GOG.com. Consider this a nice supplement to the current demo for the game, unless you're the obligatory Grinch in the family.