Wow! This was a very late, very interesting find!!
It's a hell of a big project, and I think you've done quite a good job at it. As others have mentioned, an intro / tutorial level would make it much clearer. Found myself not too sure what I was supposed to do and very confused about certain things, such as adding a building and then the building disappearing as soon as i clicked somewhere else? Not sure if bug or feature, to be honest. I'm not an expert in the genre anyway, so that probably had a lot to do. Visuals and UI would, of course, need some working on, but considering the scope, it's quite amazing!