I apologies for the super late response, but to help answer your questions:
You can make a new/restart save by navigating to "C:\Users\<name>\AppData\Local\thenthtilecraft" and you can rename/delete the save file to start a new.
The newer version V1.1 just adds player feedback so it feels good when you beat up stuff. I've also made a Linux port, which isn't much. So the newer version is just more visual then content based.
I hope these help! Thank you for playing. Also, do you know about berries/berry bushes? You can recover health using them in case you didn't know. I'm currently working on another project but I'll be coming back around to this (though it may not be until next year). Happy gaming!