I get it. But, and this won’t spoil anything, why the repetitive use of The Blue Danube waltz music...
I saw its use as a tip of the hat to "2001: A Space Odyssey." Much of 2001 takes place in a sterile environment which eventually becomes a killing field. In the same way the Escher-like stairway in Squid Game (I believe the only place that piece is played) also turns nto a place soiled by blood.
As for the series itself there has been for some time a movement in Korean cinema that mixes horror with social commentary. The height of that was of course "Parasite." Now this streamer tends to go further. I do warn certain people away from it. I definitely find it superior in its intention to American torture porn.