I don't think that making menu only clickable is a good thing.
Yes having ability to click on menu items would come in handy for touch screen devices. But sticking only to clickable items would make life for PC users a bit more complicated, especialy for those who likes using gamepads and other controlers. Anywhay having keyboard suport in menu is just a few lines of code more.
About unlocked levels having icons for user to click on would be a great idea. Another great idea would be multiprofile support (each player has his own profile).
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