If what you mean is something similar to restart level, I think I have implemented that. You can do so by pressing R button.
Regarding the hourglass, at the beginning of development, I set every hourglasses to be disappear after 9 steps. But at the last couple of minutes I thought it was too easy, so I changed it. So, I only tested it briefly. Sorry about that. I will definitely fix this in the next update. Thanks for the feedback, and thank you for playing :)