You've so nailed the feeling of swimming its wonderful. From the high speed you move at underwater to the little delay on your turns, and especially breaching the top and getting a view of the surprisingly detailed world above, its all fantastic! I will say I've not managed to find my family, and while I think the big map is great, the lack of landmarks does hurt it. I got a call back once, but I was already swimming away at speed and I wasn't able to find it again. Perhaps making the space slightly smaller but with more distinct biomes would help. But other than that, the sound design and feel are all here and feel incredible. Great job!