I very much enjoyed my time in Oslo. One of my first stops was the opera house, which is in the background of your first photo. I even booked a ticket to see a performance there.
I enjoyed the museums. I understand that there is a new Edvard Munch museum in the last few years. I would love to see that.
It was inspiring to see the interior of the city hall, where the Nobel Peace Prize is awarded.
I can understand your disappointment: you are oriented towards nature. By contrast, I love cities, so I was quite happy there.