The demon is your friend!
I'll pile on, this is great. Played through the Ironwail mod download list.
Witch House Mixtape is one of my favorite maps and Sentinel Rave is a great ending level that isn't Cthon again or something obnoxious.
Sentinel Rave especially impresses. The atmosphere going into the first part, the wild architecture, the chains, all of it. The slaughter fight at the end is my favorite end of any campaign I've played and I wish it was packaged as it's own map.