One thing I noticed on the Downloads page on your website is that the file size is advertised as 7MB, it is actually 8.03MB.
During reel play, I had a cherry and two £ symbols on the winline with hold available, 'Let em Spin' came up on the alpha, which I did, but no win came in, just had two cherries and a single bar.
If Superhold doesn't give a win, it spins in two bars afterwards and freezes on the add to trail noise and game stops responding.
One more issue, is when a Jackpot is achieved through nudges, the Nudge Now continues flashing on the alpha, even if you start a new game. I had 6 nudges on the feature, but only needed 2 to bring in the Jackpot. If it's any help, I had a Bell on reels 1 and 3, and a blue Seven on the middle reel. The only way of getting rid of it is to close the program and re-start it.
Nice game Mike... not unlike Battle Axe et al, which is no bad thing.
I've noticed that "let 'em spins" don't work if you play too quickly. e.g. nudge in the 2 of a kind, the hold buttons flash, and cos I'm so impatient, I press START and miss the big moolah.