Thanks Yee! I always really appreciate your detailed feedback! My goal on this project was to push the animations as far as I could, and actually your comment on something I worked on previously gave me the idea to set up the jump on the blend tree. We definitely had a lot of ideas we wanted to implement considering the amount of free time we all had.
We are currently looking into a bug that is preventing the player from getting killed when falling in our level border. Something broke our trigger volume there I'm assuming. The idea was that you could use the hole to escape an enemy as well as defeat them but there weren't many cases we have that we could use that sort of ability in a meaningful way.
As far as the duck , it floats on water, you can pick it up and throw it, then walk across it.
The concept behind the Ink Bar is that some puzzles could be set up to challenge you in how to solve it while managing your ink levels, but we admittedly didn't get around to adding too many of these situations.
We had played around some different ideas about how to use the sketchbook. I think if I were to change it, I'd have maybe two extra buttons that you could assign drawings to, similar to how Zelda handles items and then allow the player to freely draw them.