I love the game very much! But I have spotted a few weaknesses:
1. (SPOILER ALERT!!!) Adding advertisement garage changed the balance. Now you can create a 4x4 road "circle" surrounded by people houses and up to 13 garages and get tones of money. Enough to buy anything you want.
2. Big bugs are a great idea, but I remember one was stuck on my solar panels. Please check if they are attacking all types of buildings.
3. As it was suggested, map editor would be a perfect idea.
Hope you will improve the game!