Fun but very frustrating controls. If you mis-type a letter in one box and it's the only letter left of that letter then you can't type it elsewhere which gets

Fun but very frustrating controls. If you mis-type a letter in one box and it's the only letter left of that letter then you can't type it elsewhere which gets me right in a muddle. Also the delete key doesn't appear to work, only the backspace. Tab really ought to tab through the words as well as arrow keys, which don't cursor to filled in letters which is also frustrating. I'd like to be able to type a whole word, including over-typing the letters provided. I'd recommend playing around with the guardian crossword for inspiration of a control scheme. But fun core idea!