Wilshere scored both goals as the Gunners defeated Marseille 2-0 to remain top of the standings on 12 points, while Borussia Dortmund's 3-1 win over Napoli left them tied on nine points with the Italian side.
The England midfielder was on the scoresheet within the first minute before he added his second midway through the second half.
"It was strange as (anything) in the first 10 seconds," Wilshere told ITV of the first goal.
"We lost the ball and they had a chance and we broke really well and got in front and got a great start.
"We created a lot of chances tonight. We should have (scored more). We played great and got behind them."
Arsenal travel to Naples for their final group game knowing they have a three-goal cushion, and Wilshere is refusing to take anything for granted.
"It's a tough game, at home they are a very good team. They've got great fans," he said.
"We're not through yet - we have to regroup again. It's a tough group but we will go again."