Has the potential for being a great game, but it's unbalanced.
Area towers are WAY too cheap and can't have all this range. Also they should be unable to receive range bonus. It's possible to beat any level in any dificulty in less than 1 minute: Build 1 area tower and force baddies to make a semi-circle around it. Protect it from EMP placing it behind a 3-square wall. Send some waves early and max the area tower. Send some waves early and max bonus damage, bonus range and bonus atk rate. Done. It's still a great game, thanks a lot.