Does he have more philosophical works?

I think it depends on how you read his work. We can make anything philosophical. But I think his earlier work is much more complex, in my opinion.

'Atlas Shrugged'

That is interesting! I have myself not read any of her work yet. My philosophy department focussed more on French philosophy, and now my own research is in African philosophy. But I always see the book when I visit the philosophy section.

I have half a cupboard full of books I bought over the years, but did open yet

This is the hallmark of a reader I would say! Always buying books, and stacking them up, but always looking forward to eventually opening the book and reading it.

Milan Kundera

I really like his writing style. It is something to get used to, and can be seen as a bit "oldschool thinking", especially his views on women can be problematic, but I really like how he writes.