Great game! I enjoyed solving the puzzle. I found it confusing at first, but once I figured out how it worked, the puzzle was very good. I got stuck once where the ghost kept moving in the opposite direction to a room, until all the rooms in a large radius were locked and the ghost was far away. My suggestions:
I think having the locks on a timer to unlock (then perhaps slightly faster sanity reduction to adjust the balancing), as well as a quick reset button would help a lot.
Having the intro be click to continue would make it easier to read the instructions.
Clearer where the first clue is. Perhaps a feature where the ghost naturally pathfinds towards the next clue after an amount of time would help.
Edit: after more thought I realised path finding could be frustrating to players who wanted to solve it themselves, maybe a clue at the start would be better. As for clarity, the end point was done very well, the altar really stands out nicely.
Edit 2: just saw this was your first Jam, I had no idea, the quality was so good! You all should be super proud!
Overall, great job! Presentation was amazing too! I loved the artwork.