What a clever idea!
I got super frustrated trying to draw some kind of ear-thing? right after getting the boat. So, after half an hour or so of play, I didn't find all the secrets, but I'm done with this game.
That being said, this concept of drawing things is super clever, and I'd like to see what you could do outside of a jam, if you end up expand on it. Just be careful with red herrings.
P.S. I think I saw this on bluesky a few days ago - so you're definitely getting some decent reach with this!