That was great! The art is proficient, the music is foreboding and full of action, and the mechanics are quite fun. Weaving through the temple's puzzles and traps was satisfying. That water transparency effect is impressive!
In the last few levels, the arrows were quite difficult to distinguish from the background, especially while moving at high speed in the last level.
The volume options are much appreciated! That said, the default volumes make the sound effects a bit loud compared to the music: Music at 6 and SFX at 5 seems to be a more balanced volume.
The "Team Submarine" logo is clever; I like it!
Fantastic! Great work!