Question feedback will be shown when the question is processed. If you want to make a composite decision you can turn off the per question feedback and use conditional actions after you process all the questions on the page.
Actions can have conditions like if Question 1 isCorrect and Question 2 isCorrect … etc. So you can do things like show an initially hidden text block with feedback if all the questions are answered correctly. Then you could have an else case that might show a different text block when they are not all correctly answered.
Does this sound like it would work for your scenario?