It's pretty good. I'm not a Sci-fi fan but it was interesting and kept me hooked. The cinematography was amazing. I didn't find it slow paced or dragged out at all. Typically kdramas don't have a 2nd season, and I don't feel like this needs one.
But people need to stop comparing it to Squid Game because they are completely different shows with different genres. The only similarities is that it's a Korean drama and Gong Yoo is in it. Your making it obvious these are the only 2 kdramas you've watched. For example imagine someone making a review about criminal minds and comparing it to greys anatomy just because they are both western shows, it makes no sense.