You need $100 100 metal 100 water, and less that 1 pollution. When you have enough stuff, click on the thing you want to buy. If pollution gets to 50, you will be unable to build cats or ponds. Click buy more land to get more space. Cat cost is $10 unless you have 20 or more water, in which case the cost is $5 reduces your pollution. Can suffer from sickness. Every 5 seconds pollution goes up 1. Factory cost is 20 metal $20 every 1-10 seconds it will produce 1-10 $ metal or pollution. Apartment cost 15 metal $15 every second produces 1 metal, $1, and 1 pollution. Pond cost $30 every 1-3 seconds produces 1-10 water Mine/cave cost 10 metal $10 when you make this your cats will leave produces every 1-30 seconds produces 15 metal 15 pollution $15 and takes 10 water. Neighborhood cost 10 metal $10 gives you $50 when you make it takes 1 water every second and adds 1 pollution.
I made it (it took a long time)