I love the concept and the characters are cute but the controls need a lot of work. I downloaded this a few days before I played so I had to re-read the description to know how to control the fish. The controls also left so quickly I got stuck in one of the alcoves of the crystal room and had to restart because I missed there was a swim backwards button. Getting down the tunnel to the second turn spot was really finicky because it seems like its curved but the fish controls like a tank so making him twist and turn down the tunnel was a pain in the butt.
Its not a bad game, you just have to work out some of the kinks in the controls responsiveness and maybe have the control tag stay up longer/put the full controls in the game description.
It also might help to have a little more direction in the Crystal room, I spent a long time trying to swim at/around that statue becuase it was a slightly different color to everything else so I thought it was cueing me to do something with the statue. It took me a little while to realise I was ment to be looking for a path out.