I played Barotrauma recently and was craving for a dc game which takes place in a submarine :D Excellent incorporation of the themes "Sinking Ship" and "Treasure Hunting". I love the idea and the back story. I especially loved the water flooding effect. The post processing effects/color filter when are under the water are very succesful, they are really good at selling that we are underwater. You even simulated the levitation force of the water, when you drop an item it starts to float towards the surface! xD
It's a very short but complete game with well executed ideas. I wish it was longer but making a game with a bigger scope and finishing it in 10 days is a impossibly difficult task especially depending on the developers' circumstances. So i think making a short but complete and not broken game with fun ideas is definitely an achievment. Nice work!