Very very nice game! It took me a very long time to actually beat the game a single time, though I never lost.
There's a random update throughout the city for the blocks, which in my case meant that the last block available took about 25 seconds to turn into my own. But then it was still pleasing to see that I actually won.... after all that time!
Sometimes you really want to put pressure on some blocks and then it would be nice to be able to choose which color you want to put down with the number keys (1, 2, 3, 4) so you can react much faster. :)