What a great atmosphere you built. I only wish the hull would fill with water if you don't repair the holes. I'm sure they do in time, but that added pressure to see the hull constantly fill would be interesting. Great work!
The hull actually does fill! its just very slow. We chose to make it slow because we wanted people to have time to figure the game out and just experience it.
It fills constantly. The speed it fills scales with the amount of leaks so if you leave a lot of leaks running at once you should be able to see it going up.