This game has a great ambience. You really did a great job to let you feel this "lonelyness" under water.
Unfortunately these texts in the tutorial disappeared ways too fast. Played it twice, but still not exactly sure, if i really understood it tbh. (e.g. it asks me to ascend, but i guess it never was really described how..., )
So just dived around and tried to find the "i"s. But not exactly sure what the purpose of them is, because the tasks were a bit confusing ( e.g. clicking for turning a wheel took a while to understand^^)
But all in all, a very nice "feeling" and looking game, with a cool Intro sequence, that fits the theme perfectly, but maybe needs a bit polishing on the gameplay. And I like that you even extra made a whole settings menu :-)