Nice game shows quite some promise, I however cant seem to find what to do. On spawing I can explore the cave a bit but dont find anything, or swim up and also dont find anything. If I am missing something feel free to say so and i'll boot up the game again :].
Besides that I am a bit confused by the up and down movement seemingly not going up or down, but rotating the axle on a circle, it does make moving around a bit more challenging.
Great job on the graphics and sound design!