I guess that makes you Roy Coates then?
The fact that I can remember the developer's name after nigh-on thirty years suggests I spent rather too much time playing MM and JSW on the Dragon - not that there were many other games to be playing. Which led to my developing my own... and a career in programming thereafter :-o
Have both on my PC to this day :-) Thanks for putting the cheat codes in - made life so much easier. As you say, happy times :-D