1. In my top 10 drama's
2. Short and easily binged
3. Dark and gritty but youth and school as well
4. Suspense and Thrill
5. Atmosphere
6. Main leads that are in need of help
7. Questions what is morally correct
Both of them have blood and horror galore, and another title that appears to be a metaphor for a deep social malaise, All of Us Are Dead certainly seems to have a lot in common with Squid Game, and even features a Squid Game cast member in a major role.
I'm surprised no one recommended this yet. This has so many similarities with "All of us are dead" and are both great watch and keep you at the edge of your seat if you're into this genre.