That was a lot of fun! I see that most couldn't make it past the fish steak, but I was stubborn and tried like 20 times and got all the way to the whole cow. It's a really good puzzle game, and I think with a few QL changes it can become even better.
First, I want to agree with the other comments. there were plenty of times where I knew that I didn't get it right, yet I had to finish all my cuts and then eat all the other pieces. That reset button would be nice.
Even more important, I think it would be good to have a hard defined metric for the player to know what is good and what is bad. We're just eyeballing it, and there were definitely times where I went, "That wasn't small enough?" This is a tough one, but some kind of indicator would help.
Lastly, something that rewarded the player for completing a level would be nice. Something as simple as a check mark next to the meat I just cut on the menu would give me a huge sense of accomplishment.