Thanks for playing! And I appreciate you getting all the lighthouses :)
Yeah, that's a good idea on the fish but I decided early on that I wanted to limit the amount of text in the game. I eventually rolled that back a little for the end screen buttons but I should have probably made the fishing clearer as well.
It is supposed to just be a timing thing, where big arrow means big throw. Don't tell anyone but I think there may be a bug where the arrow is aiming and where you are actually aiming get out of sync sometimes. The aiming is so fiddly that its hard to notice though, I only discovered the bug a few hours before submission and I had a few more changes to make that were more important.