Magicka-a big fail in a great game

I just bought magicka the collection, and i find that the game as a fail that makes it less interesting.the thing is the graphics. the only thing you can change is resolution and shadow.my pc isnt that good,but i still can run it, although i would like to play it without it being slow.how can i get the magicka creator's attetion for this problem?

ps: online mode also sucks,when my friend creates a room,i can't find it.i can only find him when both of us press quick start.