Oh wow, this is just...AWESOME. O_O
I cannot believe this was made in 7 days. Really.
Even if you used many pre-made stuff, graphics, etc, you built it in a way that is pleasing, fun, and addicting!
The gameplay loop is fun and intuitive. A really interesting take on city builders. Maybe just a little unbalanced (but we all do like unbalanced games, come on!)
Needless to say, this got me stuck to the screen for a long time. You really got something here, and it works!