Needs some variety. Instead of just bars, add other buildings with different effects (increases defense chance, increase mobster gain rate, improve reputation change rates with certain factions). It could also use more fine-grained control of mobsters (focus defense on districts near competitors, abandon a district to cut losses, etc) as well as some tangible benefit to controlling more expensive districts (more tiles, much higher profit bonus).
I had to win the game by holding on to the cheapest two boroughs (buying back lost territories is easier at $1mil) until I had enough cash and mobsters to take over the other 3 boroughs all in one turn.
I spent a long time trying to set a record time by using the extra speed from the oil slick on lvl 2. Always died on the ground with no rail (quicksand?).
I'd like to see you also make a game with a more complex folding mechanism. Being able to choose whether folds cross gaps, being able to fold partial layers (if previous folds allow) would add a different dimension to the game. Some of these puzzles would have been easier, but it also opens the door for more complex models.
I don't understand how I die on boss levels. Is it a time limit? Am I allowed to get hit a certain number of times (how many? definitely more than one)? Without any sort of indicator, it just seems random.
You need to dodge the projectiles coming from the boss, if you get hit 3 times you'll restart.
I'm working on a way to indicate this better.
Edit: Changed the health bar to show your damage instead of the boss's and gave more health to the player.
I think the earlier upgrades in each vehicle need to be cheaper, and the later ones more expensive. With all three vehicles, I found myself grinding to buy my first improvements, then once I had 1 or 2 of them, I was able to earn enough for the rest very quickly.
The key to perfecting the harder horde missions is to get more houses than gold mines, pick up the gold chests, and buy enough units to split up. Also, focus on archers, assassins, and cavalry, not infantry or catapults (catapults too slow).
For everyone complaining about lag on late levels, ever consider that it isn't the graphics that are overloading your computer, but maybe the game engine that is calculating position changes and states of thousands of independent bloons and hundreds of projectiles? Maybe your computer can run Crysis 2 with no problem, but I bet in Crysis 2 you don't get swarmed by 1,000 enemies all throwing grenades.
If you want the most gold coins, make sure you spend all of your money the first time you beat a level. In other words, when you have your bridge(s) done, make a few extra pieces. Then replay and delete them to get coins for improving your score.
 "Renegade Racing"){kind=icon}
 "NYC Mafiosi"){kind=icon}
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 "Pheus and Mor"){kind=icon}
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I wasn't allowed to give any of the cars their real names.