A quick observation: please try not to advertise this so prominently as being only for Windows! Because…
(a) As a Mac user, I tend to ignore anything 'modern' that's for Windows rather than Mac. I can run any Windows software on my Mac through Parallels, CrossOver etc., but I don't unless I have a reason to.
(b) More importantly (in a sense), I've only just discovered (through finding this game as a link in a retro collection) that you’ve also issued Spectrum and C64 versions! NOW we're talking! As a retro lover (particularly of the Spectrum), this is now of MUCH greater interest to me!
So, I've bought it for the retro versions.
I never expect to play the Windows edition, though, and had it not been for someone else including this game in a retro collection, the 'for Windows' label would have caused me to miss it forever, which would have been a shame! (In reality, it's just the sort of puzzle game that I like, so I'm doubly glad I checked.)