Hello,
Finally after almost 2 months of hard work we are proud to say that Steam workshop support is here.
Make sure that you have Steam Overlay enabled to browse the workshop in-game easily.
However Uploading a level to Workshop will work without overlay also. So you have nothing to worry.
To Load the Subscribed (Downloaded) levels.
Complete Guide for workshop - https://steamcommunity.com/sharedfiles/filedetails/?id=2874356741
Let us know if you are facing any errors.
Thanks,
Team Gamergetik.