I'm trying to find something as well. I'd love to create some maps/levels for this game (and possibly 3) but can't find any helpful guides on how to use it. There's one series on YT, but I think it's in Russian, which I don't speak or understand, so that doesn't help unfortunately.

Sad there isn't a more active community around it.

for me, this is one of my favorite enemy hell games, the gore, variation, and action within it inspired me to work on my own levels. But, the thing is, i have no knowledge or experience of using the serious editor, and i also don't know how to mount workshop packages in the game either, i tried searching any guides of level editing, and 99.9% were in russian, which i hardly understand. What i would like is a full guide to at least getting started with the editor, and getting help with mapping and other procedures and scripts.