I love the color scheme throughout.
Wonderfully simple, yet effective, map.
The text is pretty densely packed.
I like the oracle deck to handle encounters and stocking the rooms. I might tighten up the explanation of how to set it up. Likewise the locking mechanism could get tightened up a bit -- we can see from the combinations that no action is performed twice in a row.
Overall, an excellent little site exploration and a great bit of worldbuilding for a game.