This concept is very interesting and the presentation is cute! The hats are a fun idea (I like the pipe). I think some mechanics could be made more explicit, for example there could be a visual indication when hiding behind seaweed (I didn't get that until I looked into the comments). Level six was a bit of a difficulty spike, because I had no idea where to go. On level nine the jump did not work properly (Bernard bounced off the surfaces instead of latching onto them). Other than that, great game!