Daniel Arzani netted his maiden international goal before Tamas Kalas put through his own net in stoppage time to give Australia a 2-1 friendly win over Hungary in Budapest on Saturday.
The second-half strikes came either side of an unfortunate Trent Sainsbury own goal and ensured van Marwijk's men head to the 2018 FIFA World Cup Russia with two wins in as many warm-up outings, having dispatched the Czech Republic 4-0 last week.
Though frustrated by a first-half performance he said was affected by a heavy training camp workload, the Dutchman was pleased with his team's positive response to forthright feedback.
"I told them at half-time I was not satisfied," van Marwijk said.
"In the second half we did, in my opinion, much better. A lot of things we did well. Not all the things.
"But in the second half, for a big part, we had control in the game."
Australia's victory was heavily influenced by exciting teenager Arzani, who broke the deadlock with an audacious effort barely a minute after his introduction.
The 19-year-old then played a key part in the stoppage-time winner, combining with fellow substitute Jackson Irvine prior to Kalas' error.
Van Marwijk praised his team's desire to push on in search of a winner following the disappointment of Hungary's equaliser.
"You saw they didn't think about [settling for] 1-1," he said. "They wanted to win and that's positive.
"We played two games in preparation, won 4-0 and 2-1. That's good for morale."
Australia now turn attention to the all-important Group C tournament opener against France on June 16. They play Denmark on June 21 and Peru on June 26.
Sources: www.socceroos.com.au
