I love highscores too! Nicely done by the way, 7900 is a very nice score! The game is difficult, but I was planning to do with infinite waves, so no one was suppose to get to the end. I like the felling of being overwhelmed by zombies (that's what zombies are all about right? ;-)). And I will certainly adjust the shake, other people told me so too.
Thanks for the precise comment, I'm really happy you enjoyed!