Magicka has sold 30,000 copies within its first day of availability through digital distribution. Developers have mentioned that they will be working on patches as quickly as possible. About the technical issues, they have stated that: "[Singe-player] works fine for the most part, Multiplayer does not -- patch on the way for both! (as soon as [Steam] pushes the button). We'll patch the game as often as possible." According to a celebratory press release, Arrowhead Game Studios is "working around the sundial and is fully committed to ongoing support by zapping glitches and communicating with players."
Source: Joystiq