Such a solid core concept! I loved the idea of a subnautica-like movable base, which you have to upgrade overtime to go deeper. I also think that there is a lot of potential, in case you decide to continue development. Like opening up new types of fish overtime or extra gear for the ship, you can even add some gear for quicker movement - like portals, or pathways for quick movement but only downwards and upwards. I also wish that different types of fish were more usefull in different situation, as is I was using blue fish most of the time since it is fast and can carry enough scraps at a time. Some minor tweaks can incude making everything move slighly faster and increasing radar camera size.
Unfortunatly, I was only able to get to about -800 meters. Is there a end point in the game, that I wasn't able to reach? I'm also curious about the way radar works - can it see scraps that are far away and go into caves? (I don't think I ever saw it work that way but I wasn't using it a lot)
Overall I had a lot of fun playing the game! Great job!