Yes, I remember this game. It gave me an appreciation of the American Football game versus what we know as Football (soccer) outside of US and Canada. I visitted my family who were in Canada in the 70's and my brother, a football fanatic just had to buy this game.
Interesting observation though. As far as I can remember, people have simulated the game of soccer for over 50 years, known as Foosball, or Table Football. It was only with electronics that they were able to make a US Football game simulator. So I guess the game must be really difficult