I've seen some in the steam workshop. I believe a couple of the ones Caiden has been making in his stream are there. Couple of people have uploaded levels from the campaign there too. Here are two I found with a quick glance at the workshop-
https://steamcommunity.com/sharedfiles/filedetails/?id=1143320890&searchtext=https://steamcommunity.com/sharedfiles/filedetails/?id=1146148564&searchtext=Now, I can't vouch for the quality of these maps as I haven't used them, but they're there for download. I'd imagine that they'll be lots more in a few weeks time. I know I'll release the ones I'm working on to the workshop once I'm satisfied that they're complete enough for use.
