But Sky Sports pundit Merson, who represented England at the 1998 World Cup, says Kane's all-round play was not good enough and needs to improve if England are to go far in the tournament.
Gareth Southgate's men played some fantastic football in the first half and perhaps should have been been in the clear had Jesse Lingard, Raheem Sterling and John Stones buried their clear-cut chances. Low expectations for this year's overhauled team were dispelled early in Russian Federation when Kane reacted quickly to score after John Stones' header was saved.
If they don't think it's a penalty, we have to deal with it, but I struggled to get the Tunisia players off me all night. The Tunisians have themselves to blame as they dropped deeper and deeper as the second half progressed and allowed England to come at them.
"I'll have to get myself one of those Russian dolls", he said.
'We have got the ice baths, the pool, nutrition where we have got a great chef here, great nutritionist making sure we get everything we need.
The Spurs striker admitted there had been some nerves present beforehand in the camp, but was full of praise for the team. We've done a lot of work on the training field and playing last we have seen a lot of games, so we've all been itching to play and it was tough. That's the World Cup. They were trying to grab hold, trying to stop us running, I couldn't move at set pieces. Yes it was a big win for us, a big boost - winning the first game always is - but then the next game becomes the most important, then the one after that... it goes on and on. Yet on that corner in injury time, he found space at the far post to place a ideal header between Farouk Ben Mustapha (who replaced an injured Hassen in goal in the first half) and his post. While Kieran Trippier enjoyed his role at the wide-right creating as many as six scoring opportunities, Kyle Walker, did not look comfortable being part of the back-three and it was his challenge on Ben Youssef that gave away the penalty to Panama.
The last time Tunisia and England met was in a group stage game at the 1998 World Cup, which the Three Lions won 2-0.
Here AFP looks at three things we learned from the match.