The download is available for free (or with donation) and includes full documented source. It's also in NextBASIC and shows off what can be achieved at this new Spectrum speed.
I was bad at Oh Mummy! in 1987, and I'm still reasonably bad at it now.
I think the biggest problem I had, and still have, is the way that it's only checking for one control at a time, so if I'm at an intersection I can't turn in an instant - I have to make sure the man is exactly lined up at the intersection before changing control, and usually he isn't (one square before, most likely) and will just stop. The guardians, on the other hand, have no such restrictions. I am now tempted to have a shot at the CPC version, just to see if there is still the same problem...
Go Mummy! certainly caught my eye when looking for Next software. 11 months to go, just 11 months to go, that's what I keep telling myself...
So I made a couple of concessions in my version. Firstly, if you're using the joystick and you're trying to turn right and your last direction is down, it'll drag you along the edge until you *can* move right.
With the keyboard you can combine keys, so if you want to move right whilst moving down a wall, you hold the two keys together and you'll slide in through gap.
It definitely annoyed me in earlier versions of my Go Mummy when I kept getting stuck just one pixel away from the path!