Loved the cluster and bomb balls. Took me quite some time to beat 20 though. I think if you level the whole castle you should win. I leveled it in one shot and got 2000 points. I tipped a flag over and got 3000 points. ¬_¬
That was amazing! It was kind of wierd how you could let the monster eat the girl for like, forever though. And the thing at the end was wierd. It seemed to just give up. And it was HUGE!
First, also, nice game, good graphics. A little basic though. Maybe some kind of story-line/upgrade system would make it good. It's good for a first game though. ;)
Strategy: Always establish power first. Go for geo-thermal or nuclear as first preference, coal as a last resort. Don't forget the grabage trucks. Get teslas and flamethrowers, farms and metal the first day. Wait out the night. Then upgrade everything to max, and change the garbage trucks to electric. Build engineers. Surround the zombie spawn with floodlights. Now your established. You should never have more than 20 smog, which is from farms. 5/5 for the game.