Hey jaogwal! Thank you so much for playing my game and taking the time to give some feedback :3.
I agree that the progression is lacking after a bit, and if I have the time to update the game it will definitely be focused around adding more progression and refining the increments to be better paced and rewarding.
I'm happy to hear that you made it into the depths of the ocean. I was thinking about having an ending, but I was planning more around some sort of growth mechanic for the pet octopus and, once they are big enough, triggering an ending. I'll have to think more about different events that I could add when reaching certain depths.