Hello game dve. I figured out how to delete the in-game checkpoint and start fresh. Unlike what the article states, there is no path to HKEY_CURRENT_USER\SOFTWARE\Unity\UnityEditor. At least on my windows 10 pro. What you need to do is remove the registry folder:
HKEY_CURRENT_USER\SOFTWARE\ViksyProductions. Then exit the registry and start up the game. The player prefs must be stored in that key. Of course save your registry before making any changes :) Hope this helps someone down the road and made you aware. Thank you again for taking your time to respond.
I have a lot of videos uploaded to my YouTube horror channel, so it'll take a bit before your game is published, but I will be back to post it when that time comes. It was a very fun game and it was optimized very well. Feel free to stop by any time if you are in the mood for a spooky indie horror game. You can find my channel here: https://www.youtube.com/c/BalimoreBlindGaming.