Thank you for your comments, I am glad the experience was novel.
We are collecting all the feedback we receive and making plans to improve the game once the jam review period is over.
The green overlay was the least annoying solution we came up with to make sanity more than just a countdown timer.
The gold and crystal resources were intended to be expendable resources, making it easier to survive through to the exit, though that did not get implemented.
I am curious whether you reached the exit portal in the level 4 safe room.