This is a basic 2D city builder. There is really only one thing to worry about; making sure you have enough water and power to supply the population. Pressing the down arrow next to the money and profit, shows water and electric demand / supply. Press the house to access the "buy menu," used to buy things. The menu has three tabs, residential, water, and electric.
Redone version of very old project from 2018: https://scratch.mit.edu/projects/132114053/