I couldn't get the game to work, and the online version had no players :(
Viewing post in Slime Adventure jam comments
A way you can actually test it out if there are no players is by running 2 instances of the game yourself and joining the server with both of them. I'll probably have a instance of the game running on my end so that there as at least 2 players that way so you can actually test it without running another instance yourself.