This game isn't that good. It dosen't have a point, a storyline, or anything for that matter. It's just a game about shooting a bazooka at zombies. Poorly thought through I'd say. The game has too much blood and gore (though badly graphicized), it still has the feeling of bloodlust through it.
How are you meant to get the Mad Scientist Achievement (in-game). I don't have enough money because I've destroyed every last city on earth apart from my home town.
Maybe the "Demolition Domination" should be worth more than the "Siege & Destroy" badge.
To get gold on all castles is quite hard (for me anyway); but to complete all the levels wasn't that bad.