I had a blast playing this game. Great work put in the graphics and details makes this game worth playing. A tip for the players on the last level: From wave 3 or so, make use of the mortars (the towers where they shoot a projectile into the air), after a few upgrades choose the right (laser) one. These can kill groups of souldiers as well as vehicles. Placing one tower strategically can cut off 2 incoming paths.
At lvl 15 i got a 1,205,401 Feet hit! My character was Denize, I used the weapon: Gorilla Arm and the items: Walkman, Ninja Headband and Alien Watch (got it through a challenge on a other game at kongregate, if you can't afford this one i recommend taking the Chain belt or Rambo Headband) Hope this helps some of you out there!