Slot felt his team shaded Arsenal in terms of performance on the night.
He said afterwards: "In the first half they were the team that played most in our half, it led to moments of crosses but not big chances.
"In the second half it was exactly the opposite where we dominated the ball possession for almost the whole 45 minutes in their half.
"The only thing that missed maybe from my side, or our team, was, again, for all the ball possession, all the moments around the box you're hoping to create even more chances.
"But against an Arsenal team that have great momentum to put up a performance like this is something I'm positive about."
Changing tactics
On how things changed after the break, Slot explained: "I think there were already spells in the first half where we showed how good we are in ball possession, but we kept on doing it in the second half and then we kept them on their 18-yard box and then we picked up the ball again.
"But even in the first half, maybe our biggest chance of the game came from maybe 20 passes in a row so I saw a lot of good moments in the first half.
"Second half, I think the way we defended was a bit better. We had to adjust one or two details. There was constantly a three-against-two we had to defend.
"Maybe in the end I'm still a little disappointed we didn't win, but it was a good performance.
"I've said 150 times already that against certain playing styles, we're a very good team, and against certain playing styles we struggle. Maybe you could even see that today, although people are now positive we kept the ball so long, but even against the low block of Arsenal we struggled to create chances.
"So that is something we would like to do better. That's one of the reasons we're so many points behind them."