I think this is a cool game. The best Tower Defense game I have played in a while. I especially like how you can specialize your mushrooms with different elements and accessories to get different results. My only complaint is that the combo list is simplified. It would be better if the order as well as just the type of elements came into effect in determining the final product.
I think this is a very good game but I agree that the badge should be an impossible badge. In order to get it you have to plan from the beginning. You have to get as much gold as possible early on by killing the enemy ships fast and NOT allowing them to shoot each other as this lowers there money value. Plus when they get close if it is only a couple ships you can just sail around them, get the timing right and you can put them back up to the top without getting touched.
I liked the game alot and played through it twice but it didn't record it all for the achievements it just recorded that i beat the first 2 levels. Whats up with that? and I agree that the fortress should have some sort of significance, perhaps as a supertower or something like that as it is called a fortress after all.