Checked out the demo, it's a pretty cool concept! I think there's a lot you could do with only being able to have sounds, text, and needing to take photos to see what the Salvor is actually doing, both in gameplay and in lewds! I also noticed it says "Optional NTR," and I was wondering how much content would be dedicated to it? Will there be enemies/monsters who you need to avoid, or they "attack" the Salvor? Maybe if you make certain choices in a dialog tree, she might purposefully get caught by other divers, and all you can do is get a blurry photo and some sound?
Whatever the plans for NTR content is, I'd love to see lots of fun teasing interactions, where you can't get a photo image and only have sound and text to go off of, that would be really fun! Maybe some scenes with the shopkeeper(?) lady too, as from the screenshot she seems a bit... Obsessive...