Imo there's kind of 2 really broad categories of what I would consider games that deserve to be considered among the best of all time. There's games that take a bunch of established ideas and structures and execute them to perfection - something like Baldurs Gate 3 or Hollow Knight. Then there's games that push the boundaries of what games are understood to be at the time (artistically speaking) like Mario 64 or Portal - there may be games now that do what they did better but those games couldn't have existed without them. This game and its dlc somehow do both. It is an absolutely singular experience and I think it genuinely might be closer to completely perfect than anything else of this scale I can think of.