Wow, I really like the visuals. Simple and effective, really felt like I was in a submarine stumbling around underwater. I don’t know if this is meant to be horror (edit: yes it is! good job!), but I was spooked a few times.
Was hoping to hear more of the story, but unfortunately got frustrated with the difficulty of the navigation pretty quickly. Took many tries to find my first sub, and when I did the read data button didn’t work at first. Maybe start off near the first sub, and give the player it’s coordinates as a tutorial?
It’d be nice to use arrow keys to move and space bar to pulse, don’t even need a windows for it. Movement was not very fun.
Really like the overall theme of the interface (felt like an under-staffed sub!) but they don’t all need to be big windows. Couldn’t fit everything on screen at one time, and e.g. the data button can just perform the action, no need to open a whole window for it.