The Dink Network

At the beginning when Kara is in the cave and it's where you first get to save is a little confusing. I mean, I got the bomb, blew up everything I was able to that was in my way, but I keep going around in circles. The only places that I can get to have fire blocking the way. And there is one particular entry way that is blocked with what looks like a brown wall thingy. This is a very fun game but I really would like to go further, especially because I have to keep starting over and over after I die since there isn't another "save" area. And I tried going back but it keeps telling me that I must find the source. What/where is the source? I have read all dialogs, it's just that it can be rather confusing at times. If someone could please help me out here, I would greatly appreciate it. Thank you!

Something that may be of help:

I started Kara with the blue dress and talked to every single person in town and went to every single house and checked out every single item.

Thank you!