Great game poor layout
The only thing that lets it down is the layout. I’m playing on a phone so making best use of screen space is important. The puzzle is at the top, plenty of space. Then there is a lot of blue background space, with the number pad plus other controls squeezed into the bottom fifth along with a fairly large Menu key. So the numbers are quite small and fat fingers have difficulty. It would be very much better if the number pad took the full width further up the screen, giving the other controls more space too.
I’m keeping going because otherwise it’s great, but I hope you can do something about this. Thanks.