All mechanics serve the submarine theme very well and are very immersive. Love the fact that I draw the map myself and the sub control is fun to play around with. Submarine + Collection has loads of potential and it could be a very good start point. Just one small thing: I think it could be unnecessary to photograph something that has been done before ( or if the first time recording makes a mark, and in later game ask me to track down the marked creature sound also interesting and realistically immersive but that would be a whole new system ), just lead me to a new area with unseen species feels attractive enough to me, like playing Dave the Diver
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Thank you for the kind words. I had other ideas for the collection mechanics, I was originally planning it to be more like documenting specific numbers of each animal and it would just expand that list as you did so. I also had a system for making the animals all start out black and white and they'd get colored when you took a picture, to indicate which specific ones you'd already gotten.