Thank you very much for your comment!
Yes, we had lots of plans, especially for the submarine and possible upgrades, sadly a lot didn't make the cut because we didn't make it in time. But we do want to work on them later.
And yes, there is a end point in the game, although it's very hidden as you have to swim to the far right to then go far left. At about -1000 meters depth you will find it.
Thank you for playing and your detailed response, it makes us very happy to know there are people playing our first ever game.
Cheers :)