Level 12 is now very close to complete and the launch of Version 0.04 is now very, very close.
All that is left to do is add in two more secrets and lots of playtesting to tweak the balance. Since recording and posting this video, I've already removed two Archviles from the final battle and reverted a wall that opens up near the blue door back into a solid wall (I comment on doing this in the video).
V0.04 Patch notes and launch announcement soon!