Nice idea and concept but it is flawed. There is no point in buying expensive land as cows are way easier to maintain and make money faster. Once you have a cow, you can not loose, I think.
The actions get interrupted for no apparent reasons, for example if you set 3 milk to "sell", some of them will just stop selling. Likewise when you buy something.
Also the timers should stop when you make an action. For example there is no point to race against the timer of the bills. If you are too late, then there is no point in waiting for the timer to deplete while the "pay" action is running.
For the cart, the race against the timer is even buggy: If you buy too late, the cart will disappear and the progress bar will get stuck and stay on screen doing nothing.