I have some ideas for improving the game.
1. Climatic zones, different plants and animals grow only suitable for a climatic zones
2. Marble and other types of stone (if any), well, and precious stones such as diamonds =)
3. Changes in weather conditions, which are also dependent on climate, such as snow or rain, etc.
4. Must need bridges, for example built in two parts, with each side of the river
5. Changing the land, such as the creation of artificial reservoirs
6. Tile laying the roof, the use of locks for doors of the house (also see below)
7. And finally the most tasty left at the end - an architectural creator --->
The user selects the size of the house on the cells, number of floors from 1 to 3 or even 5, the type of roof (flat or how it is now), will lock on the door, and inner and outer coating of walls and roofs, for example, I like the brick and I choose brick lining ..... all these branches of choice ultimately add up to a count of materials for construction
P.S. sorry for my English =)