Somehow I have managed this on the tiny dot :)

Got the happiness statue!

Also is there any more building you can get after The Machine? I just love the game and hoped there was more to it, and is there a thing for having 5000+ people? 

What are some codes you have? Because I have only found one. 

I finally built The Machine 

made it to 2000 population

Close to getting Secret Society of the Key