I really love this game. It's a great example of Jonathan Cauldwell's ability to create something that looks simple, but is at the same time compulsive in play.
It also shares the creative originality of many of his other programs.
I have a 48K Spectrum with AY chip, so its a shame I have no sound at all, unlike "Batteries not Precluded" another great JC game, where I get the full "128k" sound track and effects on my set up.