Implementing a money system
The player will earn money by killing enemies, and he is able to spend it by buying new towers to defend his fortress. By doing this, we need a game element that is able to handle a money system, in which the amount of money can increase and decrease according to the player's actions. This section will teach us how to create a money system and integrate it in the UI.
Creating and placing the money counter
As we previously did in the Lives Counter, we need to create the UI structure. So, let's create a new UI Image by right-clicking on the Hierarchy panel and then UI/Image. Rename it MoneyCounter and assign to the Source Image the currency_square image of our package. Also, we should press the Set Native Size button and then scale it down. As before, make it a tiny bit transparent by setting the alpha channel of the color variable to 232. Finally, place it just under the LivesCounter, as in the following image:
Similarly to the LivesCounter, let's create a uiText...
