It's okay, really. I would have given it a neutral rating if I could. It is one of the genres I enjoy most, but it has a few glaring flaws.
I liked:
* The puzzles are fun.
* The design is nice.
* The score is good.

I disliked:
* Characters only have two skills and you can't choose characters them freely during a run. One run is 10 hours. I got bored.
* Every four battles you encounter a merchant. But other than the upgrade of those two skills per character and buying something from the merchant, there is not much to do beside fighting.
* The story is quite flat.