You just made someone who doesn't care about football play a game all about it and actually have fun.
Only thing I'd say is that the colour contrast of the players to the pitch and the opponents in some of the puzzles could be clearer. E.g. first one I did, players were green and it was a bit in comfortable.
I'd say stick with Black, white, pink, purple, red and blue.
They are all fairly distinct from one another but also contrast the green pitch nicely.