Right, proper stuck on stage three now. There's a blue wall, and i can't get rid of it. It's the room with lots of bats and shadow people in it and a hidden chest in the top right.
Alright, first bug. Died twice to the sewer boss and now the level is stuck. When it loads in, it loads it with every enemy i defeated before dead (killing more will perma-kill them too), all blocks i've broken before also broken and the chute down to the boss is covered by some sinister smiling blocks. I can hear the boss stomping around down there, but i can't get to him.
Loading another level does not fix this.