Ever since I was a child I have loved puzzle books, especially ones with a lot of tiny, random puzzles. I'll happily solve one cryptogram, but six pages of cryptograms -- no thank you! Sage Sanctum Scramble is basically one of those comfortable puzzle books come to life, with a cute plot about destroying a monster using keywords you find by solving puzzles.
One's satisfaction with this game will likely be directly correlated with whether the puzzles within hit that sweet spot of not too difficult and not too easy. For me they did just that. One nice (and necessary!) feature is that you only need to solve around 30 puzzles to beat the monster; I solved 31 and had ten more that stumped me. Not having to check the back of the book for the answers to win the game made it a satisfying experience.
The game has some personality and I wish it had even more. There's a risk, I suppose, of getting too cute and detracting from the puzzles. But the highlight for me was when it shamelessly acknowledges that there is a slightly American bent to the game. To wit: (Spoiler - click to show) "GREY is for people who want colours. I want colors."