At the time, this solution (both the computer and the programming language) were already outdated by at least 5 years. But it was the cheapest solution for my parents, since they couldn't afford a new computer (having just started the camp site).
Of course, it took me hundreds of hours to complete the software but I didn't mind since the project allowed me to sharpen my programming chops at a pretty basic level. For instance, I had to implement my own scrolling routine (there were no text areas in GFA Basic).
Theoretically it should have been possible to make system calls to GEM routines (the UI library in ROM) in GFA Basic, but I never got it to work.
The computer was used until 2005 or so, when the disk drive gave out.
[edit: grammar]