My family had a copy of Graphical Adventure Creator too, I similarly failed to produce anything of note but I do remember having a lot of fun playing around with it and trying to design screens.

I, rightly or wrongly, attribute my love of computers to playing around on the family CPC, I really want to encourage that in my kids but I don't know what the equivalent is - I'm pretty sure it's not buying them a tablet, Raspberry Pi 500 maybe?