Hey, this was a very nice game! I finished it. I also found some unaccusable areas and once I found a door to black room, and as I walked in I lost control over my character, at first I thought it was secret but I think I just walked out of map. Didn't took a screenshot sadly.
Thanks for the feedback! The mapgen bugs have been tricky for me, but I think I nailed down the "door to nowhere" issue. It may have also been responsible for inaccessible areas. Newest version hopefully fixes those issues.