I get the feeling that somewhere a game design document exists with the following description: "A Game that combines Sim City and Tetris!" At least thats what I imagine the creators of City Rain thought before embarking on this. And it kind of works...
You can also buy specialist structures, mostly geared around improving the environment. So things like reforestation sites and eco-police.
The current needs of the city are represented by energy bars in the bottom left of the screen. Keeping all of these high is necessary to maintain a high agent status and indicate if you need to build more hospitals, police stations or need to create more jobs through shops and industry.
So generally it's quite enjoyable but feels a little unstructured, the concept just didn't seem to work for me. The idea of buildings falling worked ok but when you then have to buy specific buildings it kind of negates the point. Plus you don't really get time to appreciate the choices you've made. Each level lasts only a handful of minutes and then you're whisked away to the next. Definitely something different though!
You can get City Rain from Gamers Gate!