When I attempted to host multiplayer I was met with an infinite loading screen. Looking at ~/.local/share/Steam/steamapps/compatdata/1307550/pfx/drive_c/users/steamuser/AppData/LocalLow/PocketPair/Craftopia/Player.log there was an error saying nslookup could not be found. This led me to install nslookup.exe in the wineprefix. The main issue is that modern versions of nslookup failed in wine with an error unimplemented function DNSAPI.dll.DnsQueryConfigAllocEx. Eventually I found that ftp://ftp.manet.nu/pub/bind/windows/BIND9.2.7.zip on ftp://ftp.manet.nu/pub/bind/windows/ seemed to work (I didn't try any more up to date versions.

Installing this version involved copying libdns.dll, libeay32.dll, libisc.dll, and nslookup.exe to ~/.local/share/Steam/steamapps/compatdata/1307550/pfx/drive_c/windows/system32

After that, I was able to get past the infinite loading.

Performance was best when I forced fullscreen through window manager as opposed to through the game.

General slowness on 4k. With 1080 framerate is generally around 60