The handdrawn art is magnificent. The buoyancy in the easy mode was a little bit too much for me, because I was playing the game on my laptop and the mouse controls were a little bit clumsy for me. It would have been more relaxing if the game was a little bit easier, or perhaps there could be a "laptop mode" of difficulty. I understand why arrow keys alone won't work - it is because the strength of the dive is also taken into account.
Overall, I was impressed with the art and mechanism of the game. Thank you for making it!