These shows don't have much in common but I feel if you like one, you would like the other. I didn't really care for either one, but I preferred Squid Game to Sweet Home, while my mom loved both but preferred Sweet Home to Squid Game. Sweet Home is a bit more brutal and gory on screen while Squid Game is a bit more mentally gruesome. If you enjoy Thriller/Mystery dramas, you will prefer Squid Game. If you prefer Horror/Apocalyptic dramas, you will prefer Sweet Home.
Tag, like As The Gods Will, is and out there horror film featuring a large bit of gore. Both are about high school students. At some points, As The Gods Will feels like a fever dream while pretty much the whole of Tag feels like a fever dream.
Hyakuman Kai leba Yokatta is basically the straight version of Eien no Kinou. Both involve the main love interest dying. bother are bitter sweet romantic stories told between a ghost and a still living human. Hyakuman Kai leba Yokatta includes a true crime/mystery plotline while Eien no Kinou is mainly a romance/life drama.