Graeme McCutcheon

Yeah, I expect it's a pretty crummy experience on touch devices at the moment, I'm afraid - didn't have access to any back when I initially developed this. Will try...

In fact, it would be better wto use the page visibility API.

No, that's one thing I never got around to when porting Micropolis to JS. It remains on my todo list, although I'm afraid I'm not sure when I'll have time...