I recently got killed on the down stair, and I happened to touch on the stair tile, and it took me down to the next level (level 3 I think). The little guy reappeared, and I played on as some sort of ghost. I could only see one tile in any direction and could not use inventory items. However I could walk around and defeat monsters by touching them directly (no quickslot for fighting was there anymore). The monsters could not see me, and did not attack me when I hit them. I went down to the Goo and killed him, and then went to the shop on level 6, but I couldn't buy anything. At that point I quit.
PD on my phone in 2017 it was possible to walk and fight after death if the last action befor dying was to fall ans die by fire, with that we could continue at the third boss. Now the glitch is fix and if we dieu bien fire and fall damage there is just a "file error" message box