As of the version of Flexible Survival singleplayer released today, the game crashes with Zoom v1.1.4.
As for why I'm using Zoom, which is like 8 years old, it is because the web version(s) automatically purge your save files after a few hours, and I still have not figured out how to use the save code (the Wiki does not contain any information on how to load the current version of the save code)