"Wibbly's Big Adventure! - Talentless Software (C)1983, microdrive and dongle, mode 4, commercial
In this game you play the part of Wibbly. It's a tower defense strategy game with lots of levels (I did 72 before it got too hard!) It can be played with arrow keys or a joystick. Gameplay is intelligent, but screen updates are jerky.
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I contacted the author and it's now available for the princely sum of £5

Are you a business, or are you a DBA? Incorporating isn't as scary as it sounds, and offers you and your assets a LOT of protection against frivolous lawsuits. Liability protection was the sole reason I incorporated - I have little desire to make a huge profit, and like you my work benefits the community greatly.
I think people forget that without you, we'd basically have eBay, and no keyboard membranes as our last QLs withered and died.
Thank you, Rich.