Is there a way to continue playing the 2018 Google Halloween game?

Google keeps an archive of past Doodles on their website: https://www.google.com/doodles

It should be possible to play the Halloween 2018 doodle from there. And I don't think they will ever take it down, since Google keeps an archive going back years.

The game is still available in Google's Doodle archives: https://www.google.com/doodles/halloween-2018

When the game is starting, there's an option to "Host a Game," so that might work for spinning up your own server for friends.