One thing I thought was quite silly was the turn to the dark side of 333 (the baby's father/crypto currency guy). I get that he was never really a standup boyfriend / future father to 222/her baby, and he never really attempts to help 222 during the rope jump game and leaves her to die, but during the last game he reveals he's the father and rightfully attempts to save himself with the baby, but then 2 minutes later he's threatening to toss her off the platform, makes Anakin's fall to the dark side look like a long and deep Shakespeare tragedy in comparison. I get that he needed to die but that seemed cartoonishly evil.
456's sacrifice seemed inevitable. There really was no way to "win" against the Squid Game organization, it's too powerful. Throughout season 2/3, Front Man tries to "break" 456's faith in humanity, and nearly succeeds. It is shown through flashbacks that Front Man's own humanity was basically taken away by his time in the games, in fact it was so thoroughly destroyed he joined the organization himself and went on to lead the games. I think he sees a lot of his former self in 456 and he wants to crush that spark of faith in humanity because he wants to believe he couldn't have done better, that he couldn't have been a better man at the time, that he did the right thing.. and in the end, 456 "wins" by sacrificing himself and being the better man. That's why Front Man decides to get 456's remaining prize money and gives it to his daughter, as recognition that he really won and was the better man. But the games continue.