This was awesome. Really impressive all around, the cutscene at the beginning was great, the color palette and style was great, and it made me keep wanting to try over and over again.
The one and only criticism I have echoes what others have said, where it's a bit difficult to know where you're going to move/the shadows can be deceptive (primarily for the seaweed).
It's amazing that you chose to do the "sounds made with your mouth" thing!! Great game