Quite atmospheric, but after a few attempts I still have no idea what causes death. I stay near the sub, occasionally go out for packages, repair broken things, and the random monster attacks randomly a few times, but I have no idea how to progress without randomly dying.
Also, small bug for me on the webGL version: The first time I had no sound, but repawning after dying once fixed it for me.
So while I didn't manage to beat the game, the graphics and atmosphere were very well done, good job!