There's quite a bit of interesting discussion going on in Quarantine Circular, but I think some of the puzzles in Section 6 in order to progress forward do hold it back a little bit. That, and there are a lot of shitty endings. In particular, why does Gabriel accidentally hitting Alla lead to Gabriel losing all faith in humanity despite the fault somewhat lying with Gabriel there while hitting Teng by standing your ground leads to the exact opposite? All in all, I think Subsurface Circular has a much stronger execution of its ideas, though Quarantine Circular is still a very interesting game.