It's too hard
It's probably just because i'm a crappy gamer, but ever since the recent updates the game has become impossible to beat, i had a snazzy little strategy before hand but all of a sudden the towers i use are firing slower/weaker aswell as my gun, and the monsters seem to just walts through my defences. i can't even get past the 7th wave :( but from my past gaming experiences with this game, my fives are still, belonging to this.
It's definately one of the games people will keep coming back to, i know i do.