I will rate the squid game 5.5/10. There was no proper detail provided on the background of the major characters, somethings were not just explained which made it difficult to understand, especially the connection between the detective and he's lost brother and also the "Front man".
The promises made by "Player 456" to himself and his "dead" friends were not even emphasized on, instead it was all about finding who is behind the squid game and why it is done after meeting with one of the founder. It wasn't just real.
The script writer should emphasize majorly on the details and also should try on making the series real and understandable in the 2nd season if there is going to be.