Really well made game! In the late game the aspect of mining deep down in the cave and getting back to deliver the cookies in time was fun!
One thing that bothered me was the machine that converts the chunks into cookies take 10 seconds to finish the process. I believe the time isn't the issue, the problem is that late in the game I collected so much chunks but I had to wait there at the top making the cookies instead of going back to the mines :/. This coud be a really good insentive for the player to invest in another machine or more efficient machines so I can go back faster to having fun in the mines instead of wainting cicles just making cookies.
Wich shows how much the gameplay cicle of going down the mine and back was fun taht I wanted to be able to do it more!