Incredible fun, provided you have friends willing to play it with you, although its more fun if you don't cooperate. My experience with Magicka can by summed up by a short time period where it seemed every one of my lightning bolts (do about 5 thousand damage and attack a random target) would hit my teammate and obliderate him completely.

Why are you reading recommendations? Just buy the damn thing.

Really slick platforming gameplay with a difficulty level that manages to make you die thosuands of times in a single level without getting frustrated. Great graphics and perfect controls. You can also unlock tons of characters from various indie games eg. VVVVVV, Bit.Trip and Minecraft; and you can even play as a headcrab! 10/10 from me.