This patch supresses* crash-to-desktop errors some players were experiencing, and adds a new optional battle and new unlockable character.
Existing saves are compatible with the patch. To access the new battle you must have beaten the Ice Shrine battle.
Trailer - Desura
* - Sadly, it seems like the framework is just broken for some players in a bizzarre way. If you can't get music or sound effects to play for you, sorry, but the alternative is crashing to the desktop.
Happy new year!