Is there a guide as to the controls for Save and Quit as I have had to crash out each time? I can't find a menu anywhere

Sorry for the late reply, you probably solved your problem by now but just in case:

In the top left corner of the screen, there should be a folder with a jigsaw puzzle piece on it, you click on that folder and it will show your current playthrough stats, and all the puzzles you solved so far. In the top right corner of that screen, there should be a "Main Menu" button. You click on the "Main Menu" button and you'll be able to start a new game, or go in the option menu, or quit the game.