Graphics and sounds are good, but I think I was victim or several bugs :( I could catch animals, and somehow survivre through the waters (couldn't fish, no bubbles appear), but then I was unable to move at the third level. I restarted the game, and waited for it to pass until level 3, and still unable to move. But I think it's sad there is no win condition, like you can pass level even without saving any animal :/
I think you over scoped, which is classic. The concept fits the theme obviously, I would be glad to play it again once you can debug it!