At the first sight, the pressure of father on his son. A form of abuse , easy to see in Freudian light, more practical to recognize as ordinary aspect, hidden, often, of near reality.
A young man and his girlfriend and the difficulty for him to conquer the inner peace. So, the option remains the loneliness and presumed refuges and the fear and angry, nightmares and domination of father bulying him again and again.
I admitt , all familiar for me.
And definitory remains the last scenes , the secret, reflected by drawings and painting, reflections of inner universe and the invoked mess of room being the necessary moment of honesty, maybe start of freedom.
Well crafted , profound, fair supporting elements for give coherent form to story.