Needs an upgrade for the cash magnet. I lose so much money because I can't pick it up before the stage ends. A wider area to draw it towards you would help.
It needs the timer that many great stacking games have. Once you use your last piece, the timer starts. As long as nothing falls before the timer runs out, you pass the level.
Needs the ability to back out of talking to a quester. I've talked to several guys asking for an item I'm almost done making, but I can't ask them to wait for it. I miss out on quite a few quests that way.
Also needs the ability to use your own workers to unlock your own items (or, since you bought them, let you use them from the moment you bought them!)
How is the captain not impressed by me teaching a zombie how to play guitar, salute & properly fire a hand gun, AND care for small animals? I just created an awesome new pet!
Here's a bug on Challenge 7: After Convict transforms, he's back to normal size for the rest of the game. The challenge is to be short during the fight.
This could use an advertising mechanic, spend some gold to get a rise in customers that request what you actually sell. Since none of the villagers seem to figure out that you don't sell medicine in your weapons shop, or something like that.
Even if the tutorial takes half your gold, it still doesn't effect you much because you can't buy anything with the free gold. I need bricks to do stuff, but the store ignores the fact that I have enough of the freebies to pay for it. I call shenanigans.
There is a solution to every level where you don't need to wait more than one sec. If you'd need a timer your solution is unstable.