Magicka is as you could guess about the magical spell that one has at their disposal, these are earth, fire, water, ice, lightning, arcane, healing, and shield. These spells can be combined to give you other spells. So I could shoot a boulder at someone by using earth or I can shoot a molten piece of rock that explodes.
The controls are simply complex. And by that I mean they are simple but have a lot of depth to them. You cast a spell by clicking a corresponding key, fire is f, then you can use your right mouse button to cast it. But. You can hold shift and right click to do and aoe around you, you can shift and left click to charge it into your sword, or if your character has learnt a spell of awesome™ you can press spacebar to unleash it.
The audio provides a rather pleasant listening experience, and all the characters speak in a sort of simlish language leaving you to read speech bubbles.
Graphically the game looks great and the spells make you smile when they go of, and you feel the sheen of polish to the appearance to the game that just makes enjoyable.
The best part of the game, second to throwing "balls of magick™" is the story. And in case you didn't read the first line, it's satirical. The opening line of Magicka makes light of two of more of the most popular and influential RPGs to have existed, this continues with the meme reffence throughout the game and makes the inner nerd most happy
My only gripe is the saving, which would be the lack their of. When you reach a check point it doesn't save you there, so if you leave the game you start at the beginning of the chapter.
Oh and it's only $10 on Steam and a 700mb download. So have fun.