New update adds first version of co-op mode, only 1 map so far and still a bit buggy, test it out and let me now on discord if you encounter any bugs.
Update 21-10-24
Source: Steam Community (opens in a new tab)
Build and release context
Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.
Build 7590631 · beta branch
Steam updated · First observed