Gakpo struck twice on the night as the Reds dominated.
He said: "We started well. We could have scored more today but in the end it was a good win.
"If it was up to me I would score all the chances, in the end it was only two. We can improve. It was nice that it went in at the end. It is nice when you score.
"It is important to top the group. We should be top of the group with the quality that we have. That is well done. We have to keep going because we have big goals for the season."