That is the last level, yes. I was concerned the door blocking would be more of a logical leap than the other levels, and I didn't want people missing out on other levels for it. I am curious if you tried fitting the thrall through the passage in the right side first (or at all), or if you went for the door first. I widened the passage as a distraction and never got to playtest it.
Both ways, it does seem I'm going to have to cook up some harder puzzles, y'all are good at these.
Thanks for playing it!