Really Good concept! I always wanted to be a ghost in a game :D!
I found a little problem, when I drained all the souls on the map and I went to (I assume) the last area (the one with the bridge and where I started hearing the voices), I fell into the void, I respawned and going straight after the first door, the floor has disappeared and I continued to go down.
I hope it could be helpful.
Anyway Congrats!!!