The game was not a waste of time. I found it interesting how I was able to memorize the icons I was more familiar with better than icons I was not familiar with, despite all other variables being the same.
I believe you will receive better and more accurate/unbiased feedback if you reword "This is such a bad game." to something more neutral like "Feedback on memory game plz" and you remove "if not sorry for wasting your time.", as these will significantly lower a person's expectations. Perhaps I would have given harsher but more useful criticisms if you had omitted these (I already know there is a 80% chance my time will be wasted, and it is not a big deal imo)