The game itself is very good, but I found it incredibly annoying that I had to do the tutorial. I wanted to just learn everything from experience and figure everything out as I played, not have it spoon fed to me.
Money saving tip: Use the bank to save money through interest. The 2% interest every 6 minutes may not seem like much but it really adds up. Put ALL of your money in the bank. When the meter fills up, take the interest money and then deposit the money you earned from idling into the bank. I went from 300k to 2.5M in a day using this method.
The higher buildings go ridiculously slow at first. I know you still earn a crapload of cash from your other buildings, but...almost 2 hours for your first Bank profits?