Yeah I can kinda see that, I think minesweeper had the little timer and counter in the top corners too. I originally only had the timer but then realised the levels can get pretty difficult so needed a way to back out :P.
Hard mode is pretty difficult yet, and I haven't finished nightmare mode but I got close a couple of times so I think its possible! It works on mobile so that might be easier? :P (only slightly though surprisingly)