My god this game is genuinely stressful. The first person view, the submarine interior, and especially the way all the systems worked believably made it incredibly immersive compared to similar games.
I just barely scraped by with terrible air purity and probably 1% of my oxygen tanks left, I really thought I wouldn't make it. Especially so with this damn corner springing a leak every 0.00001 seconds while I repeatedly overcompensated with the ballasts
The only real suggestion I can come up with is finding a way to make the game begin with that pressure and stress, because for the first 30 seconds nothing really happens, and in my first attempt I just missed a few leaks at the back of the sub because I stopped playing to sip my coffee. Perhaps starting the sub in a bad condition but giving the player a short grace period to fix it could work.