Thank you so much!
I can't believe you made it so far without using the cracks correlated to the time! That's honestly impressive!
I think if I was able to go back and edit anything, I would try to make it clearer that this is your only hint on how long the biscuit will last, and to make the last two levels a little bit easier. But what's the point if you can't cause a little psychological damage to your players?