Heinola assisted on a power play goal in the third period, his fifth assist of the tournament, then helped Finland hold off a late charge from the United States to preserve a 1-0 win.
The Jets first round pick in the 2019 NHL Draft played 18:06 in the game, but perhaps no minutes were more important than with time winding down in the third period, when the Finns were on a penalty kill for the final 1:15 of regulation.
Finland will now play Canada in the semi-final on Saturday.
As for Gustafsson, he scored his first goal of the tournament in a 5-0 Sweden win over the hosts from the Czech Republic. In addition, the Jets second round pick in the 2018 NHL Draft had three shots on goal in 16:07 of ice time.
The 19-year-old continues to lead the tournament in face-off percentage, winning 71 of the 97 draws he's taken for a 73.20 win percentage.
Sweden faces off with Russia in their semi-final match-up on Saturday.
