In 2013, the Faculty of Informatics at ELTE held a competition called "Creative FireMonkey Programming Competition", where the goal was to create a Tea Garden simulator using Firemonkey - a GUI framework for Delphi. I participated the competition, and created a Tea Garden simulator of my own. It took me around a month to make it, and I won the 1st place with it.
Even if I don't use Delphi now, I gained a lot of experience with it and I had fun creating a game like this.
The game can be downloaded by following this link.