Really good game. Haven't finished it yet but I take that as a good thing.
Very minor suggestions to reduce friction. Let me switch to map from inventory and viceversa instead of Escaping my way out before choosing the other one. If using the shovel (for example) is the only interaction available in a room, let the interaction key do that instead of having to go to inventory to press the shovel.
The music for the red rooms in way louder than the others. I can easily adjust the volume levels to make it all right but I shouldn't have to.
There's a point in the moon pool and another room where the voice of the creature and the narrator overlap.
I'd love the option to have all the voiced text on screen to read.
But this is all minor stuff and nice to have things rather than must haves. You have a really good thing going here.