[AxwellMix]

A few functions you are missing to make it a full Simulation City game -
Transport - Trains, Cars, Buses? elaborating of this, you could also have traffic
Other public services - If you make houses catch fire, you're gonna need the fire services
essentials - You may want to add a power source (power station - maybe include other alternatives to) as well as a water source (Water pump) and sewage and require to have them!