Wow, very nice entry! The visuals are spectacular and the atmosphere and overall presentation was very cohesive and polished. The spooky sound effects near the bottom, plus some of the UI sound effects are nice, but I think I would have enjoyed a little ambient music or something playing some of the time as well.
In terms of gameplay, it was fun to explore on my own as I waited for new messages, although the pace of new tablet locations felt a bit slow at times.I did really enjoy the fun messages coming in and some of the “extra” things to find around (how many were there, btw?). I wouldn’t have minded some extra decoration at shallower depths too, since with the low visibility there’s not much to look at until you get to the ocean floor.
The controls took me a minute to get used to (scroll wheel for menu navigation, in particular), but they grew on me after playing for a while. It might have been nice to have a slightly faster sub, but that’s a very minor complaint.
Lastly, the extra customization options, autosaving, and map were very nice! The UI felt very polished and adding these features really sold me on it. There was a small issue where sea grass would render in front of the UI sometimes, which I guess is a risk when it’s 3D like that.
Overall, fantastic job, I hope more people get the chance to play this one!