I don't know, honestly, I didn't like that game. It was more annoying than scary. The concept itself is cool and has a lot of potential, but gameplay mechanics are bad. So let me break this down:
I must keep the oxygen level at around 21% by turning the valve. I must go down in a submarine and stop at 4100 m deep. That is pretty straightforward.
At random times, hallucinations appear. They drain my sanity and if I will touch them directly it's an instant game over. To regain my sanity, I can turn on the radio, from which the battery drains very quickly and there's no way to change the battery or something. I can also hide under the desk, but when I'm hidden, and I'm not looking at the hallucination directly, it still drains my sanity. So hiding and turning on the radio become a little useless mechanic. Before I reach 4100 meters I am dead. And also I can accidentally touch the appearing hallucination while trying to turn the oxygen valve and again instant game over.
If I'm missing something feel free to correct me or just ignore me but if I understood the mechanics correctly I cannot say that this game is a fun experience. You probably spent a lot of time and effort on this game but yeah these are my unfortunately mostly negative thoughts.
Anyways wishing you best of luck in development of future projects!