By the usual writing standards in the industry (not looking at any company affiliated with this forum, of course :shifty:) that is indeed deep. Though 'layered' might be a better term.
The same stories have been repeated for a very long time. Fundamental natures of humanity so to speak. It's not necessarily a bad thing they keep repeating in new forms, actually it's impossible to have an original story in this day and age. A completely original one would be mind blowing, they've all been told really. It's just the details that change ect. But that's a serious topic, not meant for these forums.
Edit
No I don't mean the portal repetitions. I mean if your stuck in a Portal loop you keep going through the two portals until the circuit is broken. It's technically infinite depth.