The biggest thing I need is the ability to delete a letter from a square without having to undo all the way back to when I thought the letter went there. Replacing the letter with a different one doesn't help. I need to be able to get it back to just listing the unused options for that color group, and I couldn't figure out how to do that.
Ah, thank you! It wasn't clear to me that dragging was part of the touch UI at all. I thought it was "tap square, tap letter to put in square." And then I couldn't find anything to tap to remove a letter from a square.
