Quite a unique and fun twist of a typical nonogram puzzle.
However, one glaring issue that I have noticed is that a majority of the puzzles have multiple solutions when there is only a singular hardcoded solution that allows the exit to spawn.
The issue regarding this is that this results in a lot of second guessing and/or trial and error for a typical user to figure out which solution would work. This has caused a puzzle with a simple solution needing to be retried [gathering the boxes back and hoping the next solution will spawn the door] which has resulted in a singular room becoming a slog to proceed through.