Hey batandy ^^ Just tested SD out and it's awesome.
However I've got some issues with a room in the chapel. The one with two elevators that are "inversed" (one is up when the other is down and so on). The thing is, sometimes I just get killed. No matter my amount of health. I feel I may be crushed between the elevator and the hole that visually serve as a mechanism for the elevator. It's a bit annoying, but other than that I'm having a great time right now. Oh also it feels like the Medusa's Head and Spirits hitboxes are a bit cheap for the whip. I can hit them consistently with sub weapons but sometimes my whip will fail for 5 or 6 hits, whereas I can hit bats without issues. Unless the whip doesn't hit the center of the screen ?
Anyway great job, and can't wait for that normal map update

Edit : Oh also since I'm giving feedback (and yes it's mostly feedback of stuff to enhance, but it's because I love this mod and plan to come back to it multiple times once I'm done with it ^^), I don't know if it was a bug or something, but it seems the holy water damage is a tad low. I once hit a Bone Pillar with it 3 times, and still had to give it 4 swings of fully upgrade whip to kill it :S
I'd also like to know if the "fake" secret in the Chapel is a reference to something.