Do you have limited amount of saved locations?

[Linux.Blue]

I wanted to show my mom something, the ending of the game being I find it disturbing. Thing is, I played the beginning again, and found out that the saved slot for the ending was removed.
It seems like you can't save every location. Is this a bug or what? It sure would be nice to have certain locations saved for good, in case you want to replay that particular place.