I like this type of city building games, so I liked this game too. But there are so many features needed to be added in the game.
My Suggestions are:
1. Must be added different building types.
2. Graphics must me improved.
3. New transportation ways must be added; highway, rail roads.
4. Public transportation system must be added; metro, bus stops, tram etc.
5. Must be added new entertainment places like zoo, theatre and radio building.
6. Game engine must be improved.
7. Building options and statics must be added. Like "$ Residental 6/6 Education, fire, safety infos
8. Cheats must be added.

Thank you for reading, have a nice day!