I liked the visuals of the game and the concept. Looking for hidden crabs was fun, especially with the color camouflage.
Initially I had hoped that the crabs disappear on being found, but I realized that there was visual indicator showing that they have been clicked before (bubble stream), so that's cool. Wish there was some visual fx for the shells too to prevent me from confusing them with unfound ones.
Not sure if this was intended, but i was able to "fly" by pressing space multiple times!
Overall the setting feels it would be cool in a full game; an island/pirate themed game