Before the goal was scored, the game was more like chess - a very deep defense and overlapping of all zones, so most of the attacks were positional. I think the game will change after the break - Santos must make some adjustments so that the Portuguese national team has a chance to recoup.
What kind of adjustment? The game is still early and Portugal has created more chances than the Belgians. If they keep creating more chances, goals will start pouring. The midfielders have been creative.
As both Belgium and Portugal prefer attacking than defending, this should be a goal-filled match. Belgium are number one in the world and have shown enough in the group stage to be considered favorites against Portugal, although in anything can happen (as we have seen with the Dutch). Like you said, Portugal had more chances regardless of Belgium's current lead. Let's see if the Red Devils can hold on to their lead in the second half.