England stars celebrate during the 21-16 win over Wales
A try four minutes from time by winger Elliot Daly clinched a 16th consecutive international victory for England.
"I think we have used all of our get out of jail cards," said head coach Jones. "I never think we're going to lose but we don't want all our games to be that tight.
Elliot Daly scoring England's match-winning try against Wales
"Courtney Lawes was like a human ice pack for us today. He made so many runs, gained so much ground.
"Daly has an X-factor about him. It was a great try he scored today. He did really well for us and it shows the development of the side because I'm not sure wing is his best position.
"It was a proper Test match. The crowd gave me a lot of stick, which was great.
Courtney Lawes in action for England against Wales
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"And you have to give credit to Wales. They played well. That is the best I have seen them play. It was difficult to get the ball off them."
One of England's stars was centre Owen Farrell, who added: "In glimpses we showed what we can do. It's a brilliant result and we can look at where to improve now."
England's next match is against Italy, and Jones said he might experiment with a few changes to the team for that game.