What may seem like a fantastic idea in your head, whether it be simply an idea or a fully worked-out game, can turn out to be clunky, boring and simply not work when you get put it on paper. Prototyping fast and ultimately failing fast is therefore critical to successful game design.
— Janice Turner
One thing I’ve learned is that your game is never going to please every player; there will be some very vocal opponents that want you to create the game THEY want to play. While feedback is important, evaluate the feedback and see if what they are saying is true for all players, not just them.
— Brian Lewis