Awesome concept and intresting asthetics. I would maybe add some variation to the levels and maybe more interactable stuff. Also the controls felt a bit weird. But it's a gamejam and we don't always have as much time as we would like to. But good job. Keep it up!

Cool concept. An automatic dive/rise at a button press or even as the intro to the level would be nice. You'd still have to keep track of how long it takes to dive when deciding how long to stay down. Possibly other collectibles required to complete a mission aside from treasure to make the decision even harder (i.e. 2/3 shipwreck pieces collected). Treasure could upgrade dive time and speed of movement, making it hard to leave behind for the 'mission objectives.' Also gotta have a spear gun on a line to pull yourself around quick or take down the shark!

It's good, but it lacks in the communication area. The controls should have been put somewhere in the game, because at first I didn't look at the screenshots here and had to button-mash to find out how to dive. Same thing with moving to another level, I only managed to get to the second level my moving randomly off the map. 

On the other hand I liked the start screen and the 3D models were well done. The concept of the game design was accurately planned, so I gave you 5 stars in 'theme'. I'm sorry that you guys didn't get to polishing the user experience, but it's a nice submission overall... :)