Time is unpredictable for us. When we do our run and have to go due to emergency...that's it. We gotta start the run over. Give us a save point option. Here are the ideas I have in mind

Option 1:
Make the save point cost energy. For Tier 1, 10 energy. For Tier 2, 20 energy. For Tier 3, 25 energy. If you are on the Clockworks Checkpoint (not before or after. Just on that stage), make the energy cost minus 5 for each Tier. That's Tier 1: 5 energy, Tier 2: 15 energy, and Tier 3: 20 energy.

Option 2:
Add a ticket to Boost the Merchant. The ticket costs 25 energy. The ticket will save your spot in your dungeon, but if the dungeon level has expired (example: dungeon expires in 2 days...the one on the far left), then the use for it is gone.

I was thinking of an option for Crowns...but I think that would be abused too much...