The game is about 5 hours long. Also, she's a ghost =/
It's a good game but very limited in some ways, which makes sense for the first game ever from a 2-man dev team. I enjoyed it because I love Dragon Quest. Now is the time for my obligatory reference to the game they are currently making which was on display at E3, Cosmic Star Heroine. It's going to be so good.
This means you'll undoubtedly get to Cthulhu Saves The World later in your backlog. Actually not THAT much later, if you ever get done with B.