And now, kids, it's time for great underwater stories...
Ocean of Discovery is an epic good start, good drum work and... why this topic reminded me at the very beginning of a mixture of pirate tales and army stories...
Innocent Tides is a beautiful ambient. A little playing on various musical instruments is perfectly combined with the general atmosphere... Water? In any case, it's beautiful!
Foreboding Depths - Heh... IT'S TIME FOR UNDERWATER GUITARS!
Overall, you have a very interesting soundtrack. One of the most underwater in this jam...
P.S. I like the idea for the game!