Hi Spratt ! What an awesome game you made ! It's pure puzzle gold imho.
In honor of your work I wondered if I could code something similar and month ago started work on an Atari 8bit version of such a puzzle game :) Hope you don't mind me coding such game and releasing it to the public next week in an annual Atari game compo. I've redrawn gfx to fit atari specs and wrote code from scratch in assembly. I will write all info about the original game in the credits and point every current atari 8bit user toward your games :)
All the best !
Vladimir