5thNightmare
Found a bug. Dungeon 7, Screen 41. You enter a room with perma-jinx item bubbles and the shutter closes behind you. Though you can push one of the blocks, it neither opens the door nor reveals a staircase. The player is left with no choice but to end the game through the escape menu.
EDIT: Screen 71 has the exact same bug. No walk-through walls, no staircase, no opening shutter.