So... this is really an official Mojang account? With actual permission to repost Notch's entry from Ludum Dare 22?
If so, I apologize, but this account just looks very, very suspicious.
Seriously though, is this game stolen? You have no other games posted - I would expect at least the first game of this series... Also, I don't think someone publishing their own game would describe it as a rip-off (cop-off) of another game. Sorry if I'm wrong, but this looks suspicious.
There is already a board game that's somewhat similar to this - it's called "Big City". The two aren't identical, but it was the first thing that I thought of when playing this.
One thing that would really improve the game is an implementation of hotkeys (1-4 for example) rather than having to take the mouse off of the playing field to use the various actions. I'll also second all of the calls for a money collection upgrade.
Just in case there are any anti-idle players on here, be VERY CAREFUL if you start deleting .sol files. If you delete the file "antiidlex.sol", you'll lose your anti-idle save file. Proceed with caution.
 "Minicraft"){kind=icon}
 "Penguin Diner 2"){kind=icon}
 "MegaCity"){kind=icon}
 "Penguin Overlords"){kind=icon}
 "Shoot Pixels"){kind=icon}