Great game
Really great game.
My only problem, and this doesn't lose you points as I can probably only blame myself is that I got completely stuck on lvl 9. Maybe I missed something, but so far as I could tell with some 20 tries at the level there is no way to make enough money to place enough sentry towers to kill all the armoured AIs on the first and second waves of only AI. The sentries are expensive, take ages to fire, and there are very limited spaces to put them...
But great game, nice story line and nice gameplay. The graphics are a little simple but fine for the game. All in all a good TD game, a nice addition to NG's fine collection :)