Overall cool game and good idea for the theme.
I liked:
The controls were good and I like the environment. The bubbles were cool! It was also good that I didn't die when I bashed into the pile of gold at the end, haha. The music was very fitting. Only thing I would say is that because it took me so long to get to the bottom the music needed some little bit of variance to it, to shake it up a bit.
I did not like:
The collisions just weren't precise enough for the type of game it is. The dive felt really long. Those pink wibbly things that appear out of no where towards the end scared the bejasus out of me! I have no idea what they were meant to be but I just managed to get past them by pure fluke, haha.