Pierre-Emerick Aubameyang swooped for the winner in a 2-1 triumph today.
Emery said, "He can be happy. Our idea, our gameplan on the pitch was knowing it was going to be tough because we need to adapt.
“We won in our moments we did the difference for 2-1. A lot of moments we couldn't impose our gameplan because they pushed and their gameplan was a struggle for us."
He added: "We wanted to create here one big atmosphere with our supporters, together do that way today.
“I think with some new players they made an impact today. We created this atmosphere with other players. Willock played very well.
“We can say to young players today that they will get to work here."
Dani Ceballos was outstanding on the day and Emery added: "It's to use his quality in the best position in our team. I spoke with him before coming here, it's to play as an eight and a No.10. He started like a 10 but changed with (Joe) Willock.
“He can feel better on the pitch."