Absolutely outstanding demo, very very excited to see where it goes!

Updated rating 4/5

The update of having a second save slot and fixing the bug of not being able to save is nice.

Also the explenation for the words is nice. 

However there still are a few things needing to be done.

The book words deciphering while nice is not fully there, yet, i think it would benefit from having stages on how much help you want in the book. where this could be the second step.
I think the deciper words option, could use steps where the current explenation is a nice step first step, and then if you keep deciphering you get as second step how many combinations there are, if you then keep up deciperhing you get the first word of each spell. And you can keep going till you got every word in full. (but with no description of what they do, so you have to cast it to figure that out still)

Also the back button still is broken on endings not allowing you to go back too far. I hope that gets fixed still.