This is one of the most popular Adrift 4 games outside the big competitions and it hasn't been available for online play until now because the Adrift 4 interpreter Scare has only recently been implemented in the online interpreter Parchment.
The Adrift 5 WebRunner could run some Adrift 4 games but the backwards compatibility is low so Adrift 4 games usually appear very bugged when they are not, when used with Adrift 5 interpreters.
Other advantages of playing Adrift 4 games with Parchment:
Speed does not depend on how loaded a server abroad is. The game runs entirely in your browser, including save-files. So you may disconnect internet connection after loading the game and it will still run and you can still access your save-files.