12 years! Yes, twelve years ago, Pizza business was uploaded to Freshmeat.net (these days known as Freecode.com).
Pizza Business can still be downloaded and it actually runs well on machines today, unmodified executables. This has at least been tested and reported to work on Windows machines. I have made an attempt to port the wxWindows code to wxWidgets 3.0 on Linux, then port that code over to OS X, but my initial attempts were unsuccessful. If anyone out there is interested in porting the code, feel free to give it a try if you want to. After all, since the code is open source, anyone can work on the code and make modifications :)
Looking back now, it's amazing how many things have changed since then. Desktop applications were still programs you installed on the computer and Internet Explorer was the world-dominant web browser. Mobile internet was in its infancy with ISDN-like dial-up connections with insane costs to use the service, paid for per minute and smartphones weren't even on the map yet for a couple of years to come (not counting Palm and other pocket computers which weren't phones to begin with).
These days it's all about the mobile "apps" and some desktop computers even have touch screens. Windows 8.1 now even embraces universal apps which work on multiple devices at once, such as desktop PCs, notebooks, ultrabooks and Windows Phone smartphones. Mac computers and iPhones are not exotic, they have a lot of market share and influence on how other hardware vendors design their computers.
This project has not been active for over a decade now. Anyone attempting to modify the code should be aware that old C++ code needs a lot of reworking and modernization for the code to compile correctly. It's kind of time consuming to take on the task of switching from an "ancient" version of wxWindows to the newest version of wxWidgets. Also, note that I myself do not have the resources or time to work on this project anymore. If someone wants to work on it, that person has to do the work on their own.
That said, it would be amazing to see it happen, but don't expect it anytime soon. In the meantime, please give the game a try if you own a computer running Windows. In fact, it even runs without modifications in Windows 8.1 Professional 64-bit :-)
What a cool idea! Keep up the good work!