Come on! If I would answer that I'd be stupid of course. Fascinating about movies with open endings is always that they make you think. But maybe you are asking the wrong question.
The question should be: What is the main theme and topic of the film. That I can answer for you. The main topic is "destiny". (And it even is a character)
Do we have a choice at all? Can we choose how our lives will turn out to be with our actions?
Most people want to believe they can. But they can't! Only sometimes! Some more than others.
Of course it is easier to just believe that you can and ignore times when you don't have a choice. Everybody does. I do too! That is how we live and manage our lives.
But when that time comes when you have a choice it is up to you to open your eyes and chose!
So tell me! Is Staszek dead or is he not? What do you see?
Mateusz Madry 5.12.20